Table 2.

Number of annotated protein sequences provided by UniProt and NCBI (as of 28 January 2015).

	Protein sequences
Resource/section	Archaea	Bacteria	Eukaryotes	Viruses	Totala
UniProtKBb
TrEMBL	888 257	73 062 005	12 775 469	2171 639	89 451 166
SwissProtc	19 312	331 887	179 679	16 479	547 357
NCBId
Protein	2137 968	125 291 208	26 123 069	2760 918	163 229 525
RefSeqe	1094 656	42 822 180	9709 585	213 314	53 839 396

^aIncluding unclassified and other sequences.

^bThe Universal Protein Resource Knowledgebase (http://www.uniprot.org).

^cBiologically non-redundant, expertly curated annotation.

^dThe National Center of Biotechnology Information (http://www.ncbi.nlm.nih.gov), as of 19 February 2013.

^eBiologically non-redundant, annotation partially curated by experts.