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Absolute quantification of mRNA (×102 copies of transcripts per ng total RNA) of urea transporter a2b (ut-a2b) in the gills of Protopterus annectens kept in fresh water on day 0 (FW; control), after 6 days (d; induction phase) or 6 months (mon; maintenance phase) of aestivation, or after 1 or 3 d of arousal (Ar) from 6 mon of aestivation. Results represent means ± S.E.M (N = 4).
