using the purified rat liver membrane or cultured human lymphocyte radioreceptor assay , porcine proinsulin is % 5 , split proinsulin 6 % ( 54-55 split in connecting peptide ) desdipeptide proinsulin 20 % ( deletion of amino acids 62 and 63 of connecting peptide ) and desnonapeptide proinsulin 27 % ( deletion of amino acids 55-63 of connecting peptide ) as active as porcine insulin in both assay systems ;
C0033362
proinsulin
C0006558
connecting peptide