specific activities of ( na+ + k+ ) -atpase ( ec 3.6.1.3 ) of the cell homogenate , particulate fraction and the plasma membrane fraction were 1.12 , 1.72 and 8.75 mu mol/h per mg protein , respectively , in the parent cell and 0.97 , 1.68 and 9.36 mu mol/h per mg protein in the mutant cell .
C0007634
cell
C0007603
plasma membrane