Figure 1. Immunohistochemical staining for K_i-67 and PCNA positive cells in pterygium and normal conjunctiva samples. Positive K_i-67 immunostaining showed higher nuclear staining in pterygia (A) than in normal conjunctivas (B). PCNA immunostaining showed a higher nuclear staining in pterygia (C) than in normal conjunctivas (D). All slides were counterstained with Mayer’s hematoxylin. Original magnifications: A-D, 400×.