Summary.Eighteen bone marrows collected from patients without haematological diseases and from normal subjects were tested for the effect of 4 d storage at 4°C on CFU‐C growth. Results indicate that unfractionated bone marrow cells may be stored at 4°C for 4 d with 97± 8 SEM recovery of the CFU‐C evaluated by the agar culture assay. On the other hand, the same preservation procedure on peripheral blood CFU‐C of 13 normal subjects yielded only 5± 2 SEM recovery ofin vitrogrowth capacity.The present results have practical implications. They might be exploited to preserve bone marrow CFU‐C for transplantation therapy or laboratory investigation. In contrast this single preservation procedure seems not appropriate for preserving
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