liver plasma membranes so prepared consisted almost exclusively of vesicles by electron microscopy , showed some contamination with endoplasmic reticulum and minimal contamination with mitochondria or golgi by marker enzymes , were highly enriched in alkaline phosphatase , mg2+-atpase , and 5'-nucleotidase activity compared with homogenate , and showed little enrichment in ( na+ , k+ ) -atpase .
C0001477
mg2
C0001473
atpase