Morphological, biochemical and histochemical components of mitochondria-rich (MR) cells of skin epithelium of Xenopus laevis (Daudin) were investigated after acclimation in distilled water (DW) and mild solutions (50 mmol/l) of either NaCl or KCl for over 10 days. The animals readily acclimated to NaCl, but approximately 50% of the animals died in the KCl solution. Electrophysiological measurements confirmed the poor transport properties of skin in all conditions.
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