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Fig. 3. Longitudinal (left) and transverse (right) sections of eyes of Triatoma infestans kept in DD conditions and fixed during the subjective day (A,B) and during the subjective night (C,D). Co, cornea; Cc, crystalline cone; PPC, primary pigment cell; SPC, secondary pigment cell; rh, rhabdomere; Rp, retinal pigment. Scale bars, 25 µm.