the absence of c-peptide ( proinsulin ) immunoreactivity in multigranular bodies , i.e. , in early morphological stages of lysosomal digestion , was compatible with the ready access and breakdown of c-peptide and/or proinsulin by lysosomal degrading enzymes , while the insulin crystallized in secretory granule cores remained relatively protected .
C0033362
proinsulin
C0021641
insulin