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Assay of Colony Forming Units in Culture (cfu-c)

The colony forming units in culture (cfu-c) in bone marrowcells, which were suppressed by immunosuppressive factor obtained from the serum of sarcoma 180 tumor bearing mouse, was restored to normal level by the addition of FR-900490in vitro. Furthermore, in mitomycin C (MMC)-treated mice the subsequent administration of FR-900490caused a significant increase of cfu-c in bone marrow cells depressed by MMC.