Histograms of proportions of CD5+B (B-1) cells in total peripheral B cells in NZW, B10.NZW, (NZW x B10.NZW) F1 and (NZW x B10.NZW) F1 x B10.NZW backcross mice at 8 and 16 months of age. Cut-off point used in χ2 test is indicated by an arrow.
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