of the cholesterol-side-chain-cleavage activity , 80.3+/-6.1 % ( mean+/-s.d. , n=5 ) was present in the mitochondrial fraction isolated from tumour leydig cells , and this activity was 2.5-fold increased when cells had been preincubated with lutropin/1-methyl-3-isobutylxanthine ( basal production : 194.6+/-28.6ng/30min per mg of protein ;
C0026237
mitochondrial
C0007634
cells