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Isoflurane-induced loss of righting reflex dose-response curves with 95% confidence limits bracketing the best-fit results for isoflurane (black), isoflurane + 80 ppm H2S (light green), and isoflurane + 250 ppm H2S (dark green). Sigmoidal dose-response curves show highly significant left shifts of isoflurane-induced hypnosis by H2S at both 80 and 250 ppm.
