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Fig. 4. Light micrographs of 5 µm thick sections illustrating TonEBP
immunoreactivity (TonEBP-IR) in the inner medulla of control (A) and 3- (B),
7- (C) and 14- (D) day water-deprived N. alexis. Black arrows
indicate the nuclei of the collecting duct epithelial cells that pass through
the renal papilla (A–D), and arrowheads indicate the lumen of the
collecting ducts. TonEBP-IR was quite strong in the nuclei of the collecting
duct epithelial cells in the inner medulla of control mice (A). The intensity
of TonEBP-IR in the nuclei increased as the water deprivation period was
prolonged (B–D). Scale bar, 30 µm.