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Fig. 37. Transmission electron micrographs of follicular arrangement of MR cells in Osorezan dace transferred to acid lake water (A, B), and an individual MR cell in those acclimated to neutral stream water (C). Follicular MR cells are equipped with an apical pit (asterisk), which faces a common lumen (CL) leading to the external environment. Arrows indicate electron-dense bodies in the cytoplasm of follicular MR cells. M, mitochondria; PVC, pavement cell. Bars: 1 μm. Reprinted with permission from Zool. Sci., 16, Kaneko et al., Acid tolerance of Japanese dace (a Cyprinid teleost) in Lake Osorezan, a remarkable acid lake, 871­877, 1999, The Zoological Society of Japan.

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