A, Amino acid sequences of SSTR5 from different species were aligned. Proline 335 in human SSTR5 and its corresponding residue in mouse, rat, chimpanzee, cattle, pig, dog and grass carp were underlined. B, Amino acid sequences of human SSTR1, 2, 3, 4 and 5 were aligned. Proline 335 in human SSTR5 and its corresponding residue in SSTR1, 2, 3 and 4 were underlined.