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<strong>What is the difference between the Identical Protein Groups resource (IPG) and the Identical Protein Reports?</strong></p>
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Identical Protein Reports present information about sets of nucleotide protein coding region annotations and protein accessions, for which the protein sequence is 100% identical per amino acid residue and in length. The IPG resource is the searchable collection of Identical Protein Reports. IPG search results are the Identical Protein Reports. Joining the reports into a single resource provides a smaller search result set to investigators, making it easier to identify a protein sequence of interest.</p>
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<strong>Why is a particular accession number included in the header of an IPG report?</strong></p>
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The accession number in the header of an IPG is the 'best' member of the group. The hierarchy for determining the 'best' member is:  RefSeq  &gt;  SwissProt &gt; PIR,PDB &gt; GenBank &gt; Patent</p>
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For GenBank and RefSeq proteins, each protein exists as annotation from a nucleotide record, so each protein accession has a corresponding coding region. However, the Identical Protein Groups resource includes proteins that are not just annotations; these protein-only accessions come from SwissProt, PDB, and patent (PAT) records which do not have corresponding nucleotide coding regions.</p>
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The non-redundant RefSeq proteins whose accessions begin with WP_ are generally present in multiple nucleotide records since each WP_ accession represents a unique protein translation across all the RefSeq prokaryotic genomes. See https://www.ncbi.nlm.nih.gov/refseq/about/nonredundantproteins/ for more information about this non-redundant protein set.</p>
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Another way that a single protein accession can be included in multiple coding regions is when the annotated nucleotide is a component of a CON record (a scaffold or chromosome). In that case, when the scaffold or chromosome is not annotated itself, then the annotation from its components bubbles up for display on the CON record, and both component and scaffold coding regions are presented in the Identical Protein Report. For example, EEX54505.1 is annotated on ACZS01000003.1, which is a component of scaffold GG704829.1, and EEX54505.1 is also displayed up on scaffold GG704829.1.</p>
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<p>
Proteins that are present in multiple kingdoms are generally mobile elements, or viral or phage proteins. In some cases it is not unexpected to find those proteins in both the host and the virus or phage. In other cases the sequence is a commonly used selective marker from bacteria so may be present in eukaryotic synthetic constructs (eg, chloramphenicol acetyltransferase). In other cases the presence of the same protein across kingdoms may indicate sample mix-up, misclassification, or contamination.</p>
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