Bairoch, A., and R. Apweiler. 2000. The SWISS-PROT protein sequence database and its supplement TrEMBL in 2000. Nucleic Acids Research 28:45-48.
http://us.expasy.org/sprot/
http://us.expasy.org/sprot/relnotes/
http://us.expasy.org/sprot/userman.html
ftp://us.expasy.org/databases/swiss-prot