Generation of CFC.

Number of CFC in the starting DR⁻ population at day 0 and after 2 weeks (A) or 5 weeks (B) in culture. All cultures were supplemented with 5 ng/mL IL-3 and 10 ng/mL MIP-1α. The indicated cultures were additionally supplemented with the low-dose cytokine combination. Numbers within the bars indicate the number of experiments. Comparison between HS and Stroma CM: *P < .001 (at 2 weeks); §P = .02 (at 5 weeks).