Table 2.

Blast colonies grown from subsets of marrow LSK fractions generate mast cells

	Colonies generating mast cells
Fraction generating blast colonies	Day 7–8	Day 10–11
LSK	8/22 (36%)	7/22 (32%)
MPP	4/22 (18%)	7/28 (25%)
ST-HSC	4/25 (16%)	22/58 (38%)
LT-HSC	5/29 (17%)	35/61 (57%)

Data for day 7–8 colonies pooled from two experiments and data for day 10–11 colonies pooled from four experiments are presented. MPP, CD34⁺ Flt3R⁺ multipotential progenitor cells; ST-HSC, CD34⁺ Flt3R⁻ short-term repopulating stem cells.