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A: schematic of the Na+-glucose transporter (SGLT)1 gene showing all 15 exons (top) and mRNA of the splice variant SGLT1a (bottom). The first 5 exons of SGLT1 are skipped in SGLT1a, and part of intron 5 is spliced onto the COOH terminus of exon 6. B: amino acid alignment of SGLT1 and SGLT1a. Predicted transmembrane domains are indicated by thick horizontal lines.
