Blast colony formation by single uterine CD34⁺/c-kit⁻ cells. Percentage of cells expressing CD34 (A) or c-kit⁺ (B) in each of multiple organs by flow cytometry. SKM indicates skeletal muscle. Uterine tissue contained the highest percentage of CD34⁺ cells. **P < .01 vs other organs. BM contained the highest percentage of c-kit⁺ cells. *P < .05 vs other organs (N = 6). (C) Morphology of a representative blast colony derived from a single CD34⁺ c-kit⁻ uterine cell over 20 days. Representative micrographs illustrating clonal blast colony formation in a 1:1 suspension mixture of CD34⁺/c-kit⁻ cells from GFP⁺ mice (green arrows) and RFP⁺ mice (red arrows). There was no aggregation; red and green cells formed separate blast colonies (D).