Binarized expression of bimodal genes in brain, lung, skeletal muscle and cardiac muscle. Top figure: heat map of 1265 bimodal gene expression in 217 tissue samples. A black/white point at i, j indicates gene i is "on"/"off" in sample j. Bottom figure: bimodal gene expression in KEGG cell adhesion molecules diagram. Genes marked with red are "on" in brain tissue and "off" in muscle tissue. Genes marked with yellow are "off" in muscle tissue.