Total and mast cell numbers after 8 weeks in culture. (A) Total cell numbers, and (B) mast cell numbers derived from CD34⁺/c-kit⁺/CD13⁺cells, CD34⁺/c-kit⁺/CD13⁻cells, CD34⁺/c-kit⁻/CD13⁺cells, and CD34⁺/c-kit⁻/CD13⁻cells. Results are shown as the mean ± SEM of 3 separate experiments. PB cells were used and are representative of data from BM.