we reported the identification , purification and characterization of a low molecular weight protein ( ch 21 ) expressed in vitro by differentiating chondrocytes at a late stage of development and observed in vivo in the growth plate region of the long bones at the border between hypertrophic cartilage and newly formed bone ( descalzi cancedda , f. , p. manduca , c. tacchetti , p. fossa , r. quarto , r. cancedda , j. cell biol . 107 , 2455-2463 ( 1988 ] .
C0225369
chondrocytes
C0007301
cartilage