three analogues of the carboxyl-terminal tricosapeptide of secretin ( s5-27 ) , one with glutamine replacing glutamic acid in position 9 ( 9-gln-s5-27 ) , a second with asparagine substituted for aspartic acid in position 15 ( 15-asn-s5-27 ) , and a third with both replacements ( 9-gln-15-asn-s5-27 ) were tested for their ability to interact with hormone receptors on dispersed pancreatic acinar cells .
C0061472
glutamic acid
C0017797
gln