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Effects of age and strain on MHCII+, CD11b+, CD11c+, and CD11b+/CD11c+ positive lymphocytes in circulation (A, B, C, and D, respectively) and in the spleen (A', B', C' and D', respectively) of male C57BL/6 and BALB/c mice up to 18 months of age. * Indicates strain differences within a particular age category (P < 0.05). a,b Indicates age differences within a particular strain (P < 0.05). ^Indicates P-value of 0.07 (BALB/c).
