RPS19 is down-regulated during erythroid differentiation. Rows correspond to the expression of individual genes. The 50 nearest neighbors of RPS19 (left) and Gly-A (right) are ranked by Pearson correlation. Columns represent independent microarray experiments of primary CD34⁺ cells undergoing erythroid differentiation in vitro stimulated by Epo and SCF. The dark red color indicates the highest gene expression, while the deep blue color reflects lowest gene expression. The nearest neighbors of RPS19 and Gly-A are listed in Tables S3 and S4, respectively.