insulin , biosynthetic human proinsulin and 2 human proinsulin conversion intermediates , des ( 64 , 65 ) human proinsulin and des ( 31 , 32 ) human proinsulin , were labelled with 123 i and the derivatives monosubstituted on tyr a14 were purified by reverse phase high performance liquid chromatography .
C0021641
insulin
C0033362
proinsulin