Heat map shows the percentage of mice containing an insertion in each CIS of the total number of mice with at least one insertion. Combined, WT, and Mll-AF9 refer to the 3 different CIS analyses that were performed, where combined means all insertions from both genotypes were used. The darkest red color indicates that more than 10% of the mice in that CIS list have insertions in a given CIS-associated gene, while white indicates no mice had insertions near a given gene in that CIS list, as indicated in the legend.