these results demonstrate that 1 ) ss-28 is longer acting than ss-14 in inhibiting spontaneous gh and iri release , 2 ) d-trp substitution in position 22 of ss-28 significantly prolongs the duration of inhibition of iri and glucagon release , and 3 ) ss-28 compared to ss-14 exhibits selectivity in the time course of action on pancreatic hormone release .
C0074854
ss-28
C0037659
ss-14