Northern Blot Analysis from MCAD−/− (n = 2) and MCAD+/+ (n = 2) Mice Acadm message was detected from the heart, liver, brown fat, brain, kidney, and muscle (and white fat and testes, data not shown) of only MCAD+/+ mice. Most robust expression occurred in brown fat, kidney, heart, and skeletal muscle. MCAD−/− mice had no detectable message in all tissues examined.