suspensions of intact , cl ( - ) -loaded erythrocytes ( intracellular ph , 7.2 ) were incubated at 37 degrees c in isotonic buffers ( ph 4-8 ) containing 60 mm phosphate analog for specified time intervals , whereupon influx was halted by the addition of 1 mm 4-acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic acid ( sits ) , an inhibitor of anion exchange .
C0031603
phosphate
C0003075
anion