Table 2.

Influence of thrombopoietin or interleukin-5 on the number or mean cell content of blast colonies stimulated by stem cell factor

Experiment number	Stimulus
	SCF	SCF + TPO	SCF + IL-5
1	13*	18	15
2	25*	25
3	24*	20
4	14*	17
5	13*		14
6	12*	11
7	21*	22
1
Dispersed	1,310†	810	1,170
Multicentric	6,220†	6,680	6,960
2
Dispersed	250†	440	–
Multicentric	1,760†	2,470	–

Cultures of 50,000 C57BL bone marrow cells were stimulated for 7 days by 100 ng of SCF with or without 50 ng of TPO or 10 ng of IL-5. Data shown are mean blast colony counts from duplicate cultures or mean blast colony cell counts from pools of 10–30 colonies of each type. 

*Blast colony number. 

^†Mean cells per blast colony.