Summary of Lmo2, AML-1, and PU.1 gene-expression programs of individual CD34⁺c-kit⁺ cells. The first 4 positions (A1-A4) contain no cells and serve as negative controls, and the last 4 positions (E2-E5) contain 10 cells each and serve as positive controls. The remaining positions represent the amplification reactions of single cells, with the presence of a symbol indicating positive amplification for the gene product indicated.