a comparison of rat and bovine chromogranin a reveals similar features : clusters of polyglutamic acid , similar amino acid composition , position of seven of 10 pairs of basic amino acids , identical placement of the only two cysteine residues , a highly conserved n- and c-terminus , and a sequence homologous to porcine pancreastatin 1-49 [ ( 1986 ) nature 324 , 476-478 ] .
C0002520
amino acid
C0301714
basic amino acids