the exchange of the n-terminal pentapeptide for the n-terminal pentapeptide of human somatotropin releasing factor ( h-srf ) resulted in a peptide ( [ 1-tyr,2,4-di-ala,5-ile ] secretin ) with practically no srf-activity ( less than 1 % srf-activity up to 100 micrograms/kg in the rat ) , but surprisingly high secretin activity ( almost 100 % in the rat , but only 1150 cu/mg ( 27 % ) in the dog ) .
C0086418
human
C3538902
di