Table 6.

HSC production early in LTBMC

Culture		Percent positive animals (no. positive/transplanted)					Repopulating units per 105 cells (95% confidence interval)
Type	Time	5,000 cells*	10,000 cells*	25,000 cells*	50,000 cells*	100,000 cells*
TPO	1 month	0  (0/6)	0  (0/7)	33 (2/6)	75  (3/4)		0.9  (0.1–1.7)
	2 months	13  (1/8)	57  (5/7)		100  (5/5)	100  (5/5)	6.7  (2.8–11.5)
Control	1 month	13  (1/8)			60  (3/5)		1.6  (0.1–3.0)
	2 months	0  (0/5)	14  (1/7)		33  (2/6)	60  (3/5)	0.9  (0.2–1.6)

Animals were assayed 3 months posttransplant. Transplanted animals were considered positive if >0.5% of the peripheral leukocytes expressed CD45.1. Repopulating units were calculated by using the maximum-likelihood model (25). 

^*Number of NA cells transplanted.