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Immunohistochemical localization of AQP1 water channel protein in chinchilla inner medulla. A: section from 60–75% of the way along the inner medullary axis, demonstrating heavy labeling of numerous thin limbs. B: section from papillary tip. Few thin limbs were labeled in this region. *A collecting duct. Scale bar: ∼100 μm. Figure was modified from Chou et al. (17).
