In the search for new marker genes suitable to distinguish chondrocytes fro
m osteoblasts and mesenchymal stem cells in culture, we have identified and
characterized a novel gene called chondrocyte expressed protein-68 (CEP-68
), harbouring an N-terminal leader peptide and an epidermal growth factor-l
ike calcium-binding domain. CEP-68 defines a new family of proteins and com
plements collagen type II as a new marker for stem-cell-based chondrogenic
tissue engineering.