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Intact B lymphopoiesis in fetal liver. Percentages (a) and absolute numbers (b) of fraction A-D (B220+IgM−) and immature (B220+IgM+, fraction E) B cells in the fetal liver of E18.5 embryonic siblings from Atp11cemp/Y × Atp11c+/emp matings. Each symbol represents an individual embryo, and data are representative of two experiments with 8–14 embryos per experiment.
