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Degranulation responses of splenocytes from six woodchucks that had resolved WHV infection. Splenocytes were isolated, stimulated in vitro for 6 days as indicated, and subsequently subjected to the CD107a degranulation assay. The mean value for each group is indicated by a bar. The difference between the group receiving stimulation with peptide pool 4 and the unstimulated controls was analyzed by using the Mann-Whitney U test (P < .01).
