History and Diagnostic Significance of C-Peptide

Figure 2

(a) Schematic representation of human proinsulin. Drawing based on Chance et al. [5]. B-chain (yellow) and A-chain (green) are linked by C-peptide (red) via two pairs of basic amino acid residues (blue)

(b) Sequence of human C-peptide (31 amino acids, see [1])