TABLE 6.1 (Continued)GeneProtein nameTissue distributionSubstrate propertiesSelected inhibitorand (inducer)Driving forceSLC28A2CNT2Kidney, heart, liver,skeletal muscle,pancreas, placenta,brain, cervix,prostate, smallintestine, rectum,colon, lungPyrimidine nucleosides,adenosineNa+free bufferSLC28A3CNT3Mammary gland,pancreas, bonemarrow, trachea,intestine, liver, lung,placenta, prostate,testis, brain, heartNucleosides andnucleoside analoguesNa+free buffer146