insulin , proinsulin and desoctapeptide insulin all inhibited the association and degradation of 125i-insulin by bbv , but these processes were not appreciably affected by the insulin-like growth factors igf-i and igf-ii or by cytochrome c and lysozyme , low molecular weight , filterable , proteins , which are known to be reabsorbed in the renal tubules by luminal endocytosis .
C0021641
insulin
C0033362
proinsulin