Table 2.

Frequency of day 12 CFU-S in SCL^lacZ/w bone marrow

Bone marrow* fraction	Cells injected per recipient	Spleen† colonies	Spleen weight, mg
Uninjected (4)	0	0.3  ±  0.5	20  ±  1
Unsorted (4)	5 × 104	10  ±  2	94  ±  33
lacZneg (5)	5 × 104	1  ±  2	28  ±  17
lacZint (5)	6 × 103	50  ±  43	62  ±  35
lacZhigh (5)	6 × 103	103  ±  27	151  ±  37

^*Bone marrow cells from SCL^lacZ/w mice were injected into irradiated recipients. The number of recipients for each fraction is given in parentheses. 

^†Spleens were harvested after 12 days and macroscopic colonies counted. Values represent the mean ± SD colony numbers calculated per 5 × 10⁴ cells injected.