Mesenchymal progenitor cell subpopulations are differentially sensitive to radiation. Amifostine protects both mesenchymal and hematopoietic progenitors against radiation injury, though the level of protection appears to be dependent upon the sensitivities of these progenitor cells to radiation. Amifostine is a potent stimulant of BFU-E and CFU-GEMM progenitor colonies.
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