Probable sugar transporter (PubMed:28083649). Even if its physiological substrate is subject to discussion, it is able to transport glucose and fructose (PubMed:29548810, PubMed:28083649, PubMed:16186102). Does not transport galactose, 2-deoxy-d-glucose and xylose (PubMed:15033637). D-glucose(out) = D-glucose(in) D-fructose(out) = D-fructose(in) Glucose and fructose transport are inhibited by the flavonoid apigenin. Expressed in small intestine and colon (PubMed:15033637). Weakly expressed in testis and prostate (PubMed:15033637). Expression is increased in presence of fructose. Belongs to the major facilitator superfamily. Sugar transporter (TC 2.A.1.1) family. Glucose transporter subfamily. According to some reports, mediates transmembrane transport of glucose and fructose (PubMed:15033637, PubMed:16186102, PubMed:29548810). However, another group could not confirm transporter activity for glucose or fructose (PubMed:28083649).