amino_acid_pairs        Generate amino acid pairs
amino_acids             The 20 standard amino acids
amino_acids_properties
                        Amino acid side chain property values
as_one_letter           Convert three-letter amino acid codes to
                        one-letter codes
as_three_letter         Convert one-letter amino acid codes to
                        three-letter codes
grantham_distance       Grantham distance
grantham_distances_matrix
                        Grantham distance matrix
grantham_equation       Grantham distance
