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<p class="tableOfContents"><strong>Table of Contents: <a href="/pubs/techbull/mj13/mj13_issue_cover.html">2013 MAY&#8211;JUNE No. 392</a></strong></p>
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<h1 class="articleH1"><em>NLM Classification</em> 2013 Edition </h1>
<p class="tbyearmonth">Willis SR. <em>NLM Classification</em> 2013 Edition. NLM Tech Bull. 2013 May-Jun;(392):e1. </p>
<div class="articleactions">2013 May 01 <span class="status">[posted]</span>
</div>
<div class="articleParagraph">
<p>
The <em>NLM Classification</em>, available online at <a href="//www.nlm.nih.gov/class/">//www.nlm.nih.gov/class/</a>, incorporates all additions and changes to the schedules and index from April 2012 through March 2013. The <a href="//www.nlm.nih.gov/class/terms_cond.html">PDF version</a> will be updated with 2013 classification data by the end of May 2013.
</p>
<p>
The QU (Biochemistry. Cell Biology and Genetics) schedule was the major area of focus for the 2013 edition.  </p>
<dl><dd>Background: With the 2005 edition of the <em>NLM Classification</em>, NLM established a new range of numbers in QU for cells (QU 300-400) and genetic concepts (QU 450-500). These topics were formerly scattered in various numbers in the Library of Congress general biology schedule, QH.  When the genetic terms were brought into the NLM schedule, they were split between the QU schedule and the QZ (Pathology) schedule (for clinical aspects).</dd></dl>
<p>With the 2013 edition:</p>
<ul>
<li>Most genetic terms have been consolidated in the QU schedule</li>
<li>Several new class numbers were created in the QU schedule for genetic terms</li>
<li>Genetic terms currently classed in QZ deal with genetic causes of diseases and genetic testing</li>
<li>Animal genetic terms are classed in LC QH schedule (e.g.,  <em>Animals, Genetically Modified</em> is classed at QH 442.6)</li>
</ul>
<p>In addition:</p>
<ul style="list-style: none;"><li>Some notes at the beginning of the QU schedule were added or changed. For example:
<ul style="list-style: none;">
<li><em> Classify medical genetics in QZ 50 </em>was changed to <em>Classify genetic causes of disease in QZ 50.</em></li>
<li><em>Classify viral genetics in QW 160</em> was added.</li>
<li><em>Classify plant genetics in QK</em> was added.</li></ul> </li>
<li>Some QU schedule outline headers were changed. For example:<br />
<ul style="list-style: none;"><li><em>QU 145-220 Vitamins </em>was changed to <em>QU 145-220 Nutrition. Vitamins</em></li></ul></li>
<li>Some QU class number captions and notes were revised to better reflect the scope of the number. For example:
<ul>
<li>At QU 34, the caption <em>Biochemical phenomena (General or not elsewhere classified)</em> was changed to <em>Biochemical phenomena. Molecular biology (General or not elsewhere classified).</em></li>
<li>At QU 84, the caption <em>Sugar acids and their salts and esters (General or not elsewhere classified) </em>was changed to <em>Sugar acids. Sugar alcohols. Sugar phosphates (General or not elsewhere classified).</em></li>
<li>At QU 130, the caption <em>Inorganic substances (General or not elsewhere classified) </em>was changed to <em>Inorganic chemicals (General or not elsewhere classified).</em></li>
<li>At QU 220, the caption <em>Other vitamins </em>was changed to <em>Flavonoids.</em></li>
<li>At QU 107, the note was added: <em>Classify works on growth hormone at WK 515</em>.</li>
<li>At QU 375, the note was added: <em>Classify physiology of specific cell with the cell</em>.</li>
<li>At QU 500, the note was added: <em>Classify works on genetics in general in QU 450</em>.</li>
</ul></li></ul>
<h2>Class Numbers Added and Canceled</h2>
<p>Thirty-two (32) <a href="//www.nlm.nih.gov/class/newclasses.html">new class numbers</a> were added.  No class numbers were canceled.</p>
<p>&nbsp;</p>
<table width="650" cellspacing="0" cellpadding="4" summary="Table of Class Numbers Added for 2013.">
<caption align="top">
<strong>Class Numbers Added &#8212; 2013</strong>
</caption>
<thead>
<tr>
<th id="a1" width="120" align="left"><strong>New Number</strong></th>
<th id="a2" width="320" align="left"><strong>Class Name</strong></th>
<th id="a3" width="210" align="left"><strong>Former Number in the Index</strong></th>
</tr>
</thead>
<tbody>
<tr>
<td width="22%" valign="top"><p>QU 45</p></td>
<td width="52%" valign="top"><p>Macromolecular substances (General or not elsewhere classified)</p></td>
<td width="24%" valign="top"><p>None</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 55.95</p></td>
<td width="52%" valign="top"><p>Protein engineering</p></td>
<td width="24%" valign="top"><p>QU 450; QZ 52</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 78</p></td>
<td width="52%" valign="top"><p>Glycosides</p></td>
<td width="24%" valign="top"><p>QU 75  </p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 81</p></td>
<td width="52%" valign="top"><p>Monosaccharides</p></td>
<td width="24%" valign="top"><p>QU 75  </p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 85.6</p></td>
<td width="52%" valign="top"><p>Lipid metabolism (General or not elsewhere classified)</p></td>
<td width="24%" valign="top"><p>QU 85  </p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 91</p></td>
<td width="52%" valign="top"><p>Prostaglandins</p></td>
<td width="24%" valign="top"><p>QU 90  </p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 102</p></td>
<td width="52%" valign="top"><p>Biological factors</p></td>
<td width="24%" valign="top"><p>None</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 130.2</p></td>
<td width="52%" valign="top"><p>Metals (General or not elsewhere classified)</p></td>
<td width="24%" valign="top"><p>QU 130</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 130.4</p></td>
<td width="52%" valign="top"><p>Minerals</p></td>
<td width="24%" valign="top"><p>QU 130</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 145.3</p></td>
<td width="52%" valign="top"><p>Nutritional requirements</p></td>
<td width="24%" valign="top"><p>QU 145  </p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 145.7</p></td>
<td width="52%" valign="top"><p>Nutrition policy (Table G)</p></td>
<td width="24%" valign="top"><p>QU 145  </p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 145.72</p></td>
<td width="52%" valign="top"><p>[Nutrition policy] General coverage (Not Table G)</p></td>
<td width="24%" valign="top"><p>QU 145  </p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 460</p></td>
<td width="52%" valign="top"><p>Genomics</p></td>
<td width="24%" valign="top"><p>QU 58.5  </p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 465</p></td>
<td width="52%" valign="top"><p>Molecular medicine</p></td>
<td width="24%" valign="top"><p>None</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 550</p></td>
<td width="52%" valign="top"><p>Genetic techniques (General or not elsewhere classified)</p></td>
<td width="24%" valign="top"><p>QU 450; QZ 52; WB 60</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 550.5</p></td>
<td width="52%" valign="top"><p>Specific techniques, A-Z</p></td>
<td width="24%" valign="top"><p>None</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 550.5.C4</p></td>
<td width="52%" valign="top"><p>Chromosome mapping</p></td>
<td width="24%" valign="top"><p>QU 450; QZ 52</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 550.5.C5</p></td>
<td width="52%" valign="top"><p>Cloning</p></td>
<td width="24%" valign="top"><p>QU 450; QZ 52</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 550.5.D6</p></td>
<td width="52%" valign="top"><p>DNA fingerprinting</p></td>
<td width="24%" valign="top"><p>QU 450</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 550.5.G4</p></td>
<td width="52%" valign="top"><p>Gene expression profiling</p></td>
<td width="24%" valign="top"><p>QU 450; QZ 52</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 550.5.G47</p></td>
<td width="52%" valign="top"><p>Genetic engineering</p></td>
<td width="24%" valign="top"><p>QU 450; QZ 52; WB 60</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 550.5.M8</p></td>
<td width="52%" valign="top"><p>Mutagenicity tests</p></td>
<td width="24%" valign="top"><p>QU 450; QZ 52</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 550.5.P6</p></td>
<td width="52%" valign="top"><p>Polymerase chain reaction</p></td>
<td width="24%" valign="top"><p>QU 450</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QU 560</p></td>
<td width="52%" valign="top"><p>Genetic therapy</p></td>
<td width="24%" valign="top"><p>QZ 52</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QV 56</p></td>
<td width="52%" valign="top"><p>[Pharmaceutical preparations] Adverse effects (General)</p></td>
<td width="24%" valign="top"><p>QZ 42</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>QV 58 </p></td>
<td width="52%" valign="top"><p>Drug overdose. Prescription drug misuse </p></td>
<td width="24%" valign="top"><p>QZ 42 </p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>W 76.1 </p></td>
<td width="52%" valign="top"><p>[Health manpower and services, distribution and characteristics] General coverage (Not Table G)</p></td>
<td width="24%" valign="top"><p>W 76</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>W 81</p></td>
<td width="52%" valign="top"><p>Medical tourism</p></td>
<td width="24%" valign="top"><p>None</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>WA 289 </p></td>
<td width="52%" valign="top"><p>Consumer protection and product safety (General)</p></td>
<td width="24%" valign="top"><p>WA 288</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>WN 195 </p></td>
<td width="52%" valign="top"><p>Optical imaging </p></td>
<td width="24%" valign="top"><p>None</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>WR 670 </p></td>
<td width="52%" valign="top"><p>[Skin] Surgery </p></td>
<td width="24%" valign="top"><p>WR 650</p></td>
</tr>
<tr>
<td width="22%" valign="top"><p>WS 220 </p></td>
<td width="52%" valign="top"><p>Palliative care. Terminal care </p></td>
<td width="24%" valign="top"><p>WS 200</p></td>
</tr>
</tbody>
</table>
<p>&nbsp;</p>
<h2>Table G (Geographic Notations)</h2>
<br />
Changes were made to <a href="//wwwcf.nlm.nih.gov/class/TableGOutline.html">Table G (Geographic Notations):</a><br />
<dl><dd>One Table G number was added: GB1-- Balkan Peninsula</dd></dl>
<h2>Other Changes to the Schedule</h2><br />
Changes were made to other class schedules. For example: <br />
<dl><dd><ul>
<li>At QZ 42, <em>Adverse effects of drugs </em>was removed from the caption.</li>
<li>At QZ 50, <em>Heredity. Medical genetics </em>was changed to <em>Heredity. Genetic causes of disease</em>.</li>
<li>At QZ 52, <em>Genetic techniques </em>was changed to <em>Genetic testing</em>.</li>
<li>At WG 141.5.A3, <em>Angiocardiography. Angioscopy </em>was changed to <em>Angiography. Angioscopy</em>.</li>
<li>At WG 500, <em>Radiography </em>was removed from the caption.</li>
<li>The schedule outline <em>WR 650-670 Therapy </em>was added<em>.</em></li>
<li>At WX 162, the caption was changed from <em>Patient care planning. Progressive patient care. Long-term care</em> to <em>Hospital care. Patient care planning. Long-term care</em>.</li>
<li>Instructional notes were added or modified to clarify classification practices as needed.  For example:
<ul>
<li>A note was added to QY 95: <em>Classify techniques associated with a specific type of cell with the cell.</em></li>
<li>A note was added to WG 169: <em>Classify works on cardiac anesthesia in WG 460.</em></li></ul></li>
<li>Table G (geographic breakdown) is now permitted with W 76.</li></ul></dd></dl>
<p>All index entries pertaining to the aforementioned schedule additions and changes were modified.</p>
<h2>Changes to the Index</h2><br />
<p>One hundred and eight (108) new index entries were created of which forty (40) are from the 2013 MeSH;  the remainder are MeSH terms from previous years. All main index headings are now linked to the 2013 vocabulary in the <a href="//www.nlm.nih.gov/mesh/MBrowser.html">MeSH Browser</a>.  </p>
<table border="1" cellspacing="0" cellpadding="0" width="100%">
<tr>
<td width="100%" valign="top"><br />
<strong>New Index Term</strong></td>
</tr>
<tr>
<td width="100%" valign="top"><p>1 ABO Blood-Group System -- WH 420 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>2 Administration, Intravenous -- WB 354 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>3 Ageism </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>4 Arterial Pressure -- WG 106 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>5 Autacoids </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>6 Autophagy -- QU 375 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>7 Binge Drinking -- WM 274 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>8 Biochemical Processes -- QU 34 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>9 Biological Factors -- QU 102 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>10 Biomarkers, Pharmacological -- QV 745 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>11 Biometric Identification -- W 786 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>12 Boron Neutron Capture Therapy -- QZ 269 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>13 Butyrates -- QU 90 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>14 Cardiac Imaging Techniques -- WG 141 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>15 Cell Adhesion -- QU 375 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>16 Cell Lineage </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>17 Cell Physiological Processes -- QU 375 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>18 Chemical Safety </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>19 Chitosan -- QU 83 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>20 Community Integration </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>21 Controlled Substances -- QV 55-57 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>22 Coronary Angiography -- WG 141.5.A3 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>23 Deoxy Sugars -- QU 75 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>24 DNA Helicases -- QU 137 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>25 DNA, Fungal -- QW 180 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>26 Dermatologic Surgical Procedures -- WR 670 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>27 Device Approval -- WA 289 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>28 Diagnostic Test Approval -- WA 289 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>29 Drug Overdose </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>30 Elder Nutritional Physiological Phenomena -- WT 115 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>31 Exocytosis -- QU 375 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>32 Fertility Preservation </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>33 Food Quality </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>34 Gene Expression Regulation, Plant -- QK 981-981.7 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>35 Gene Regulatory Networks -- QU 470 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>36 Gene Targeting -- QU 550 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>37 Gene Transfer Techniques -- QU 550 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>38 Genes, BRCA1 -- WP 870 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>39 Genes, BRCA2 -- WP 870 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>40 Genocide </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>41 Genome -- QU 470 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>42 Genome, Bacterial -- QW 51 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>43 Genome, Plant -- QK 981-981.7 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>44 Genome, Viral -- QW 160 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>45 Geography, Medical -- WB 700-720 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>46 Health Impact Assessment -- W 84.4 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>47 Health Information Management </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>48 Health Information Systems </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>49 Health Services for Transgendered Persons -- WA 300-395 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>50 Homophobia -- HQ 76.4-.45 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>51 Immunoglobulins, Intravenous -- QW 601 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>52 Inappropriate Prescribing -- QV 748 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>53 Inflammation Mediators -- QV 247 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>54 Inventions </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>55 Ion Channel Gating -- QU 55.7 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>56 Macromolecular Substances </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>57 Magnetic Resonance Angiography </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>58 Mandibular Reconstruction -- WU 600-610 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>59 Maternal Death -- WQ 270 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>60 Mechanotransduction, Cellular -- QU 375 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>61 Medical Tourism </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>62 Molecular Medicine -- QU 465 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>63 Motivational Interviewing -- WM 55 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>64 Multienzyme Complexes -- QU 135 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>65 Mutagenesis, Insertional -- QU 55.95 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>66 Narrative Therapy -- WM 420.5.N3 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>67 Neurotology -- WV 21 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>68 Ochratoxins -- QW 630.5.M9 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>69 Optical Imaging -- WN 195 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>70 Organophosphate Poisoning -- QV 627 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>71 Organophosphonates -- QU 131 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>72 Pathologic Processes -- QZ 140 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>73 Pathology, Molecular -- QZ 50 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>74 Peptide Biosynthesis -- QU 68 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>75 Peroxisomes -- QU 350 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>76 Personal Narratives </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>77 Personal Narratives as Topic </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>78 Phosphorous Acids -- QV 138.P4 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>79 Physical Therapist Assistants -- WB 460 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>80 Prescription Drug Misuse </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>81 Prostate-Specific Antigen -- WJ 762 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>82 Proteome -- QU 460 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>83 Public Health Surveillance -- WA 950 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>84 RNA Interference -- QU 58.7 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>85 Racism -- HT 1503-1595.22 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>86 Radionuclide Ventriculography -- WG 141.5.R3 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>87 Receptor, Insulin -- WK 820 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>88 Receptors, Chemokine -- QU 55.7 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>89 Receptors, Cytoplasmic and Nuclear -- QU 55.2 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>90 Receptors, G-Protein-Coupled -- QU 55.7 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>91 Receptors, Serotonin -- QV 126 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>92 Retroelements -- QU 470 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>93 Rotator Cuff -- WE 810 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>94 Sexism -- HQ 1237-1237.5 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>95 Sialic Acids -- QU 84 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>96 Solid Waste -- WA 778-788 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>97 Somatomedins -- QU 107 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>98 Spinal Cord Stimulation </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>99 Telomerase -- QU 141 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>100 Telomere -- QU 470 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>101 Terminology as Topic -- W 15 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>102 Tobacco Products </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>103 Tomography, Optical -- WN 206 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>104 Transgendered Persons </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>105 Tumor Necrosis Factors </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>106 Vascular Access Devices -- WG 26 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>107 Waste Water -- WA 778-788 </p></td>
</tr>
<tr>
<td width="100%" valign="top"><p>108 Water Resources -- WA 675-690</p></td>
</tr>
</table>
<br /><br />
<p>Numerous main index entries and cross references were modified to reflect changes in the MeSH vocabulary.  For example,  </p><br />
<ul>
<li><em>Aldosterone Antagonists</em> was deleted as a main heading and made a cross reference to <em>Mineralocorticoid Receptor Antagonists.</em></li>
<li><em>Jaundice, Hemolytic</em>, formerly a cross reference to <em>Anemia, Hemolytic</em>, is now a cross reference to <em>Jaundice</em>.</li>
<li><em>Gene Therapy </em>was changed to <em>Genetic Therapy.</em></li>
<li><em>Balloon Dilation </em>was deleted from the index.</li>
<li><em>Geography, Medical, </em>formerly a cross reference to <em>Geography</em>, is now a main index heading. </li>
<li>The main index heading <em>Handwashing</em> was demoted to a cross reference and the cross reference,<em> Hand Disinfection, </em>became the main index heading<em>.</em></li>
</ul>
<p>To learn more about the <em>NLM Classification</em> see the <a href="//www.nlm.nih.gov/pubs/factsheets/nlmclassif.html">Fact Sheet</a>.<br />
</p>
</div>
<p class="articleParagraph">
By
Sharon R. Willis <br />
Cataloging Section, Technical Services Division<br />
</p>
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<strong>Last updated:</strong> 01 May 2013</p>
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