DKK1 AND FRZB are necessary for chondrocyte (RE)differentiation and prevention of cell hypertrophy in 3D cultures of human chondrocytes and human mesenchymal stem cells. (April 2016) - Zhong, L.; Huang, X.; Rodrigues, E.; Leijten, J.; Verrips, T.; El Khattabi, M.; Karperien, M.; Post, J.