Even so, an INMT present in rabbit lung was proven to possess a much higher Km (270 uM, Thompson and Weinshilboum, 1998; 340 uM, Raisanen and Karkkainen, 1978) than the brain enzyme in rats. This instructed that INMT could exist in various isoenzyme sorts concerning species And maybe even in the exact animal, Each and every having various Km's and