Influence of the transplantation of graded numbers of normal fresh BM cells on the leukocyte recovery of myeloablated recipients. The upper part of each diagram illustrates the number of transplanted CFU-GMs. Each point represents the leukocyte count of one recipient. A total number of eight mice was initially included in each group, with the exception of the group transplanted with 3 × 10⁶ cells, which consisted of four mice. Windows 1 and 2 show the influence of the graft size on the period required for achieving representative numbers of leukocytes (see text).