the usable 125i-labelled antigen for human proinsulin-c-peptide ria could be prepared by chloramin t method and enzymic method wich labelled 125i to tyrosyl human proinsulin connecting peptide , and active ester method which conjugates 125i-labelled active ester to human proinsulin connecting peptide .
C0033362
proinsulin
C0006558
connecting