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Gene expression of (A) urea transporter a2a (ut-a2a) and (B) urea transporter a2b (ut-a2b) in the eye (E), brain (Br), gills (Gi), heart (H), liver (Li), spleen (Sp), pancreas (P), gut (Gu), kidney (K), Lung (Lu), muscle (M), and skin (Sk) of P. annectens kept in fresh water.
