Differentially expressed genes between B6 and B6.SJL stroma are distributed throughout the mouse genome. (A) Using a statistical threshold of P < .05, differentially expressed genes are concentrated on mouse chromosomes 11 and 17, and genomic distribution cannot be attributed only to chromosome size. (B) Using a statistical threshold of P < .01, differentially expressed genes are enriched on chromosomes 1 and 7 when displayed relative to chromosome number (top), and on chromosome 17 when displayed relative to chromosome size (middle). Correlation between chromosome size and the number of differentially expressed genes does not account entirely for genomic distribution.