superoxide dismutase activity , observed with polyacrylamide gels impregnated with nitro blue tetrazolium , was present in : ( 1 ) the mitochondrial fraction [ density ( rho ) 1.169g/ml ] , containing the high-molecular-weight kcn-resistant enzyme , and ( 2 ) the cytoplasm fraction , containing the low-molecular-weight kcn-sensitive enzyme .
C0026237
mitochondrial
C0010834
cytoplasm