Cordin-like 1 (CHRDL1) is an antagonist of bone morphogenetic protein 4. It may play a role in topographic retinotectal projection and in the regulation of retinal angiogenesis in response to hypoxia. Cordin-like 1 (CHRDL1) is an inhibitor of the bone morphogenetic proteins (BMPs) that have functions in inducing ectopic bone formation. CHRDL1 acheves its inhibiting ability through affecting the osteogenic differentiation of MC3T3-E1 cells. Besides its function as an antagonist, CHRDL1 enhanced the proliferation of human mesenchymal stem cells in a BMP2-independent manner.