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Immunofluorescent localization of Na+- and glucose-linked transporter (SGLT) 4, SGLT5, and glucose transporter (GLUT) 2 in isolated perfused rat proximal straight tubules. A: SGLT4 is localized to the luminal membrane of proximal tubules. B: luminal localization of SGLT5. C: GLUT2 is localized to the basolateral membrane. For A and B, white dashed lines outline the tubule. For C, white dashed lines outline the tubule and the lumen.
