investigation of enzyme activity in homogenates of various rat tissues , as well as in their respective subfractions , reveals that : ( 1 ) the specific activity of brain tissue exceeds those of liver and kidney and ( 2 ) most of the activity in liver tissue is localized in the 20 000 x g supernatant , containing the endoplasmatic reticulum , the ribosomes and the soluble part of the cytoplasm , while in brain tissue a high activity is found in the nuclei fraction .
C0023884
liver
C0736268
liver tissue