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A population of procollagen molecules has been isolated from the culture medium of a clonal line of calf dermatosparactic cells and shown to have the amino-acid composition, physical properties, and molecular structure consistent with collagen precursors. Although this procollagen population shares immunologic determinants with the procollagen obtained from dermatosparactic skin, it differs from the latter in aminoacid composition, in subunit properties, and by its content of bothamino and carboxyl terminal non-collagen peptide appendages. We propose that the cell culture procollagen contains earlier biosynthetic forms of dermatosparactic procollagen.