Proportions of LTC-IC–positive clones as a function of the size of the clones at day 10. Data are from the same experiments as for Fig 4. Single CD34⁺CD38^low (A) and CD38^neg (B to C) cells were grown with (A,B) or without (C) serum, in the presence (▪) or in the absence () of MS-5 cells. Results obtained in low GF and high GF have been pooled. Each bar represents the proportion of LTC-IC–positive wells at day 10 according to the size of the clone as indicated on the horizontal axis.