ca2+-atpase molecules were labeled in intact sarcoplasmic reticulum ( sr ) vesicles , sequentially with a donor fluorophore , fluorescein-5'-isothiocyanate ( fitc ) , and with an acceptor fluorophore , eosin-5'-isothiocyanate ( eitc ) , each at a mole ratio of 0.25-0.5 mol/mol of atpase .
C0001476
ca2
C0001473
atpase