The protein entries in the Entrez search and retrieval system have been compiled from a variety of sources, including SwissProt, PIR, PRF, PDB, and translations from annotated coding regions in GenBank and RefSeq.

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	Additional protein information			Retrieve taxonomy information
	In addition to Protein sequences, other protein-related information is available via Entrez. Search the Structure database by choosing, "Structure" from the Entrez pull down menu, Conserved Domains Database (CDD) by choosing, "Domains", and 3D Domains by choosing, the "3D Domains" option.			The Entrez protein database is cross-linked to the Entrez taxonomy database. This allows you to find taxonomy information for the species from which a protein sequence was derived. First, look up a protein in Entrez. A "Taxonomy" link appears to the right of each entry that is linked to the Entrez taxonomy database. To view all non-redundant taxonomy links for a search result, select "Taxonomy Links" from the drop-down menu above the search results and click on the "Display" button to the left of that menu.