Total numbers of types of CFCs in the spleen after administration of 5-FU in C57/Bl6 mice.

Serial determinations of different types of colonies compared levels in young wild-type C57/Bl6 mice (6-8 weeks; ■) and old wild-type C57/Bl6 mice (33-46 weeks; ▤). The results of a single experiment representative of 2 independent experiments are shown.