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Analysis of B lymphoid colony-forming cell activity. (a) Colonies formed per 5 × 104 total BM cells plated in semisolid medium in the presence of IL-7. (b) Analysis by limiting dilution of colony-forming potential of immunopurified pro-B cells on ST2 cell stromal layers. Logarithmic fractions of no cell growth after 7 days of culture are indicated along with input cell number per well.
