in the absence of inhibitor , the self-exchange flux of sulfate ( ph 7.4 , 25 degrees c ) at high substrate concentration displayed self-inhibitory properties , indicating the existence of two anion binding sites : one a high-affinity transport site and the other a low-affinity modifier site whose occupancy by anions results in a noncompetitive inhibition of transport .
C0038720
sulfate
C0003075
anions