FUNCTION Type X collagen is a product of hypertrophic chondrocytes and has been localized to presumptive mineralization zones of hyaline cartilage.SUBUNIT Homotrimer.INTERACTION Prolines at the third position of the tripeptide repeating unit (G-X-Y) are hydroxylated in some or all of the chains.DISEASE The disease is caused by variants affecting the gene represented in this entry.