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Immunohistochemical findings (CD4, CD8, and CD68). A: CD68 expression at the margin of the corneal ulcer from case 4 sample. B, C: CD8+ (B) and CD4+ (C) T cells were not detected in this sample. E, F: Control samples for CD8 (E) and CD4 (F) immunostaining. D: Control sample. CD68 immunostaining.
