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Photomicrographs (phase-contrast microscopy) of C6 rat glioma cell cultures. In (A), we see a culture that received vehicle treatment (DMSO 0.5%). After rotenone application, cell viability decreased significantly (B). The application of 132.1 μg/ml V. officinalis to a rotenone-treated culture (C) protected the culture against the rotenone toxic effect. Scale bar = 100 μm.
