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Fig. 1. Phase-contrast images of Ax2 cells 1 minute after exchange of the medium to buffer with (B) or without (A) 2 mM quinine. Also shown are scanning electronmicroscopic (C) and high-magnification phase contrast (D) images of Ax2 cells extending protrusions in response to 2 mM quinine. Bars, 10 µm (A,B); 5 µm (C,D).