A method and composition are provided for inducing or enhancing chondrogenesis
in vivo or in vitro. The method is performed by exposing the cells in vitro or
in vivo to an extracellular matrix comprising of type I collagen, type II collagen
or a mixture of type I collagen or type II collagen and hyaluronate and further
containing BMP-4 or a combination of BMP-4 and GDF-5.