Bifunctional growth regulator. May contribute to the rapid growth of cartilage and vascular invasion prior to the replacement of cartilage by bone during endochondral bone development. Plays a role as antiangiogenic factor in cardiac valves to suppress neovascularization (By similarity). Accumulated in the inter-territorial matrix of cartilage. After cleavage, the post-translationally modified ChM-I is secreted as a glycoprotein. Belongs to the chondromodulin-1 family.