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Fig. 1. Schematic representation of a dark- (left) and a light- (right) adapted ommatidium of Triatoma infestans. Transverse sections at different levels of the light-adapted ommatidium are also shown on the far right. bm, basal membrane; Co, cornea; Cc, crystalline cone; N, nucleus of the retinula cell; PPC, primary pigment cell; S, sphaeroid; SPC, secondary pigment cell; R, retinula cell; rh, rhabdomere; Rp, retinal pigment.
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