Abstract
A method for comparing amino acid compositions of proteins (Cornish-Bowden, 1977) has been extended to allow proteins of unequal lengths to be compared. The method has been tested by applying it to proteins of known sequence. It tends to exaggerate the amount of difference between unrelated proteins. It is therefore a reliable guide to possible sequence similarities, in that it does not suggest that sequences are similar when they are not, though it sometimes fails to detect genuine similarities. When applied to related proteins the method gives results in good agreement with those predicted. A phylogenetic tree for 37 snake venom toxins has been constructed from their compositions and is similar in most important respects to one constructed from the corresponding sequences.
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