by combined use of amino acid analysis , chemical sequence determination for the n-terminal decapeptide and two-dimensional 1h nuclear magnetic resonance at 500 mhz the amino acid sequence of bull seminal inhibitor iib was found to coincide with that of the isoinhibitor iia , except that the n-terminal tripeptide pyrl-gly2-ala3- in ha is replaced by the dipeptide h-leu2-phe3- in iib .
C0017984
gly2
C0012512
dipeptide