Expression of hCAT1 mRNA in human cord blood cells. Nuclear cells were isolated from cord blood cells. The specific primers described under “Materials and methods” were used for determining expression of hCAT1 in whole cells, CD34⁺ cells, CD34^- cells, glycophorin A⁺ cells, and glycophorin A^- cells. Data are presented as ratios with respect to whole (nonfractionated) cells.