Documentation is available.
A name for this protein, so that you can recognize it later in the results. The pI and Mw of that protein, if known, as well as error ranges that reflect the accuracy of these estimates. This will produce the list of proteins from this species, as well as a list of proteins independently of species. This will produce the list of proteins matching this keyword. Amino acid composition of a known protein, obtained in the same run as the amino acid composition of the unknown protein.