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Mean exhaled CO2 in mice. Data are presented as mean ± standard deviation (SD). NC, negative control group; PC, positive control group; Lower dose, groups of 0.0001 mg/L prallethrin and 0.104 mg/L d-phenothrin exposures; Higher dose, groups of 0.001 mg/L prallethrin and 1.04 mg/L d-phenothrin exposures
