Fig. 8. Y-chromosome-positive cells in female recipients of male bone marrow-derived SP cells. (A-D) Y Chromosome FISH carried out on sections of the tracheal epithelium showed the presence of male donor cells (TxRd; red) located on the epithelia of the tracheas that were isolated from female mice transplanted with male bone marrow-derived ROSA26 SP cells. Bar, 10 µM.