The upset plot shows the number of differentially expressed genes by response, with overlaps by treatment category and tissue. The horizontal bars to the left indicate the total number of differentially expressed genes associated with each of the four conditions. The filled in dots in the dot matrix, together with the corresponding vertical bars then show how these genes are distributed. For example, of the 1150 differentially expressed genes in the Hippocampus associated with “Toxo Up”, 837 are only associated with the “Toxo Up” dataset (1st column), while 287 are shared with the “Cocaine Down” dataset (5th column) and 26 are shared with the “Cocaine Up” dataset (7th column). Within categories, tissue overlaps are indicated (bracketed). Genes represented are mouse genes identified as being significantly differentially expressed (likelihood ratio test, FDR<0.1) across pairs of conditions within a tissue.</p