Procollagen 1 Carboxyterminal Peptide (P1CP) is the precursor of collagen, synthesized in osteoblasts and fibroblasts and subsequently converted to form collagen by procollagen peptidase. Many diseases are associated with an increase in the amount of collagen synthesized, i.e. an increase in the rate of bone matrix formation and turnover. On antibodies-online you may find a rat-specific ELISA kit for the detection of P1CP for research on osteoblasts, fibroblasts and other connective tissues.