C-peptide
noun
                                                                                                                            
                                                            C-pep·tide
                    
                                                                                                              
                                                                                                                                  ˈsē-ˈpep-ˌtīd  
                                                      
                                                          
            
                                
              
          
                                                      : a protein fragment 35 amino acid residues long produced by enzymatic cleavage of proinsulin in the formation of insulin                                      
                
                    
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  Merriam-Webster unabridged




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