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Fig. 4. Bright-field (A,C) and fluorescence (B,D) images of an Aedes aegypti blood-fed midgut sheet stained with fluorescently labeled Crotalus adamanteus PLA2 and fixed. The images in C and D are a higher magnification of the upper portion of the midgut shown in A and B. Scale bars: A, 500 µm; C, 100 µm.