sephadex g-50 chromatography of 11 extracts showed up to four peaks of irs , one co-eluting with synthetic somatostatin-14 ( s14 ) , a second co-eluting with synthetic somatostatin-28 ( s28 ) and two other peaks having approximate molecular weights of 6000 and 10 000 , respectively .
C0037659
somatostatin-14
C0074854
somatostatin-28