Figure 3: Immunohistochemical staining of cultured human epithelial cells on amniotic membrane. (A) Limbal epithelial cells were positive for K3 (brown; magnification 200×). (B-D) Part of the cells were positive for involucrin, K19 (basal layer only; 400×) and p63 (brown; magnification 400×). (E-G) The cultured cells were negative for K14 (200×) but positive for integrin α9 (200×).