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Species- and sex-specific LT curves for exposure of adult mosquitoes to 0.75% permethrin in a WHO tube bioassay (females: solid lines, black circles; males: dashed lines, crosses). The LT50 calculated from these figures are An. arabiensis ♀ 48.19min, An. arabiensis ♂ 33.21min, An. gambiae ♀ 135.7min, An. gambiae ♂ 213.3min.
