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Fig. 1. Examples of isolated trout intestinal cells in normal physiological saline (no added Cuo) after 15 min (A) and 3 h (B), compared to cells exposed to saline containing 800 µmol l–1 Cuo for 15 min (C) and 3 h (D). Cells were photographed in phase contrast (not fixed or stained) using a Leica DMIRB microscope and a Nikon coolpix digital camera. Scale bar, 2 µm.