Injection of mice with IL-2 synthetic peptides. C57BL/6 mice were injected with 10 μg of rIL-2 protein or peptide 3, 4, 5, 6, or 7 at 7 days and 4 h before ocular infection with HSV-1 strain McKrae. The first injection included CFA, and the second injection included IFA. Demyelination in CNS tissues of infected mice was assessed at 14 days p.i. Arrows, areas of demyelination.