however , the 9000-12,000 mol wt material had characteristics entirely distinct from proinsulin of either human or animal origin : c-peptide reactivity was undetectable using any of three sensitive radioimmunoassay systems , on page it migrated more rapidly than proinsulin-like material , and in contrast to proinsulin , it was unaffected by proteolytic degradation .
C0006558
c-peptide
C0033362
proinsulin