Figure 4. B lineage deficiencies in the BM of CD154^−/− mice.

Total cell numbers of all B lineage cells (CD19⁺B220⁺) and B lineage subpopulations were determined in BM of aged (11–13 months) CD154^−/− or C57/Bl6 mice by flow cytometry using markers described in Materials and Methods. Results derived from nine C57/Bl6 and 10 CD154^−/− mice; P values determined by Student's t test.