four different amino-reactive reagents , 4-acetamido-4'-isothiocyano-stilbene-2,2'-disulfonic acid ( sits ) , ( 1 ) 1-fluoro-2,4-dinitrobenzene ( fdnb ) , 2,4,6-trinitrobenzene sulfonic acid ( tnbs ) , and 2-methoxy-5-nitrotropone ( mnt ) decrease the anion permeability of the human red blood cell , as measured by sulfate fluxes , whereas the sulfhydryl agent , parachloromercuriphenyl sulfonic acid ( pcmbs ) , does not .
C0003075
anion
C0038720
sulfate