Plays a role in the regulation of chondrocyte maturation and postnatal endochondral ossification. May inhibit cell growth stimulation induced by FGF2. Interacts (via the extracellular domain) with FGF2. Appears as reticular-like structures throughout the cytoplasm and adjacent to the plasma membrane. In proliferation and hypertrophic chondrocytes, detected intracellulary and in the pericellular extracellular matrix. In primary spongiosa, detected only in the extracellular matrix. Expressed in cartilage.