A database of protein sequences from eight organisms: human (Homo sapiens), mouse (Mus musculus), rat (Rattus norvegicus), fruitfly (Drosophila melanogaster), worm (Caenorhabditis elegans), yeast (Saccharomyces cerevisiae), plant (Arabidopsis thaliana), and bacteria (Escherichia coli). (See the ProtEST web page.)