in contrast to these small changes in myosin atpase activity , large changes indicative of maturation of energy metabolism occurred in the creatine kinase system : between 115 days gestation and 21 days postpartum , total creatine kinase activity increased nearly 8-fold ( 0.2 to 1.6 iu/mg cardiac mass ) , the mm-creatine kinase isozyme increased 7-fold ( 0.2 to 1.5 iu/mg wet weight ) , and mitochondrial creatine kinase increased more than 25-fold ( less than 0.01 to 0.27 iu/mg wet weight ) .
C0010287
creatine kinase
C0914594
mitochondrial creatine kinase