To assay inhibition of the early mosquito stages of parasite development, P. berghei gametocytes expressing green fluorescence protein (GFP) under the control of the ookinete specific promoter CTRP were induced to undergo in vitro fertilization and subsequent development to ookinete stage in a standard 96-well plate assay, essentially as described [23]. Successful development to ookinete stage was assayed by GFP fluorescence measured using an Enspire fluorescent plate reader (Perkin Elmer).
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