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A: primary mRNA transcript of urea transporter (UT)-A2 (11 exons; top) and the mRNA transcript of UT-A2c (bottom). The last two exons of UT-A2 are skipped in UT-A2c, and part of intron 9 is spliced onto the COOH terminus. B: amino acid alignment of UT-A2, UT-A2c, and UT-A2d. Boxes indicate intramembrane helixes labeled according to the model of Levin et al. (22).
