Polypeptide cartilage-inducing factors found in bone.

摘要

Two polypeptide factors that are found in bone and that have chondrogenic/osteogenic activity and TGF- beta activity are described. Each has a molecular weight of approximately 26,000 daltons by SDS-PAGE. Each reduces to a single polypeptide indicating that the factors are probably homodimers. One has an N-terminal sequence identical to that of human placenta-derived TGF- beta , whereas the other has an N-terminal sequence that is different from that of TGF- beta derived from human placenta. The two factors are purified to homogeneity using RP-HPLC or acetic acid-urea gel electrophoresis.