Fig. 1

Characterization and identification of OECs. a, b Primary cultured OECs on day 10 under phase contrast microscopes. c, f Identification of immunocytochemistry for p75 and p75 positive cell purity of primary cultured OECs. d, e Primary cultured OECs on day 13 (three days after subculture) with or without activation under 20 × contrast microscopes. Scale bar: 100 μm