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Circadian flight activity of inseminated non blood-fed Anopheles stephensi in an acoustic actograph under a 12:12 hour light/dark regime (top) and on transfer from a light/dark 12:12 hour to a constant darkness regime (bottom). Dark bars on x-axis refer to periods of darkness, white bars to periods of light. Hourly flight activity is a score (out of 60) indicating the number of minutes per hour during which mosquitoes undertook flight.
