insulin-independent transporters: GLUT1(RBC, brain, cornea, placenta), GLUT2(βislet cell, liver, kidney, small intestine; 2way), GLUT3(brain, placenta), GLUT5(spermatocytes, GI tract; fructose)
SGLT1/SGLT2 (kidney, amall intestine; Na⁺-glucose cotransporters)