based on the modified emmelot method , sufficiently pure pm preparations could be obtained from the hepatomas in the form of large membrane sheets without any contamination by other identifiable components , as determined with an electron microscope , and with high specific activities of the marker enzymes , such as na+ , k+-sensitive atpase [ ec 3.6.1.3 ] ( na+ , k+ -atpase ) , mg2+ -atpase , and 5'-nucleotidase .
C0001473
atpase
C0001477
mg2