Comparison of the chimerism in individual hemato/lymphoid organs of the recipient chimeric mice. The percentage of donor-derived cells (Ly5.2 positive cells) at 8 months after transplantation in each organ was analyzed by flow cytometry. The chimerism in BM was defined as 100. Percent chimerism was calculated as (percentage of the population in each organ)/(percentage of the population in BM). The average proportion of each cell lineage in individual organs is shown as T lymphocytes (□), B lymphocytes (), myeloid (▨), others (▪). Experiments were performed using seven bcl-2−/− chimeric mice and four control chimeric mice from which the means were calculated.