Noun
procollagen (plural procollagens)
(biochemistry) The precursor of collagen; it is formed in fibroblasts and converted to collagen by a peptidase.
In this step, oligosaccharides (not monosaccharides as in step 3) are added, and then the procollagen is packaged into a secretory vesicle destined for the extracellular space. Source: Internet
This is not yet collagen but its precursor, procollagen. Source: Internet