Transcriptome analysis of ABCs and FO, MZ, and B1 B cells. (A) Results for some of the genes that changed expression level only in ABCs, together with expression values for some control genes. Up- and down- regulated transcripts are indicated in red and blue, respectively. The magnitude of expression is depicted by the color bar. (B) A genealogical tree, based on gene expression by the different B cell populations that were analyzed, was created by GeneSpring X software based on gene expression profile of analyzed B cell populations.