Single SPlow Sca-1+ cells were sorted in individual wells of a flat bottom 96-well plate containing 100 μL Methocult m3434. Colony number was assessed 12 days after sorting. Two-tailed P values with Fisher exact test: SPlow compared with KLS34- (P < .2); KLS34- compared with Hoechst (P < .7); KLS34- compared with KLS34- with Hoechst (P < .2).