Box plots of log
-transformed gene expression data. (A) Boxplots of log2-transformed FPKM values for each chromosome in the human lymphoblast 45, Xp sample and (B) Boxplots of the average gene expression of each chromosome relative to the average gene expression of all autosomes. Blue dots indicate X chromosome values for each library. In B, note that a value of 0 indicates equal expression with other chromosomes, while a value of −1 indicates expression at half the level of other chromosomes.