ENG and osteoarthritis: In a word, the most likely markers that can be identified on the surface of CSPCs include CD9, CD29 (integrin β-1), CD73 (5'-nucleotidase), CD90 (Thy-1 membrane glycoprotein), CD105 (Endoglin), CD44, CD166, CD49e (integrin α-5), CD54 (intercellular adhesion molecule 1), as well as VCAM-1, STRO-1, and Notch-1 coexpressed in osteoarthritis, which provides important information for the continued in-depth study of CSPCs.