in the second experimental system , ( na , k ) -atpase purified from rectal glands of squalus acanthias was reconstituted with defined phosphatidylcholines as the lipid solvent and spin-labeled phospholipids with choline or serine head groups ( pc* , ps* ) as the solute .
C1959616
phosphatidylcholines
C0031617
phospholipids with choline