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Comparison of the Kinetics of Colony Forming Units in Spleen (CFUs) and Culture (CFUc)

Summary. A comparative study of the in vitro kinetics of CFUs and CFUc indicated that: (a) there is a five‐ to seven‐fold increase in CFUc numbers under conditions which result in a progressive depletion of CFUs; (b) refeeding the cultures delayed the late decline in CFUc numbers without affecting CFUs; (c) using cycling CFUs or adding erythrocytes to the culture markedly improved CFUs survival without affecting that of CFUc; (d) the CFUc/CFUs ratio changes during marrow regeneration, but in the opposite direction which would be expected if CFUc were a part of the cycling CFUs population. It is concluded from these that the two operational definitions, CFUs and CFUc, do not denote the same cell type under the culture conditions described.