Graham,
One such site is:
http://www.expasy.ch/cgi-bin/sprot-search-ful
Good luck,
Tom Neubert
_______________________________________________
Thomas A. Neubert, Ph.D.
Skirball Institute of Biomolecular Medicine
New York University School of Medicine
540 First Avenue, 5th Floor
New York, NY 10016
tel: (212) 263-7265
fax: (212) 263-8214
e-mail: neubert@saturn.med.nyu.edu