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(a) CFSE-labeled cells in the intestine of a C. parvum-infected CD40−/− mouse 6 days after injection of 107 CFSE-labeled wild-type spleen cells. Magnification, ×400. Higher-power (magnification, ×1,000) phase-contrast (b) and green fluorescence (c) views of ileum show that labeled cells lie adjacent to the base of a crypt (arrow). Comparable results were obtained with five more animals.
