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The number of B cells of different subsets per µl of blood in normal and nude rats. In the blood of nude rats immature B lymphocyte numbers are increased, whereas those of mature B lymphocytes are decreased. Bars represent the mean ± SD (n = 8 for each group). * and † indicate a significant difference between normal and nude rats (Mann–Whitney U-test); *P < 0·05; †P < 0·01.
