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Blunk, Torsten and Sieminski, A. L. and Appel, Bernhard and Croft, C. and Courter, D. L. and Chieh, J. J. and Göpferich, Achim and Khurana, J. S. (2003) Bone morphogenetic protein 9: a potent modulator of cartilage development in vitro. Growth Factors 21 (2), pp. 71-77.