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Fig. 2. Light microscopic immunohistochemistry using the anti-Papilio RBP
in the retina of Papilio xuthus. (A) Schematic drawing of an
ommatidium. Longitudinal view. Arrows on the left indicate the approximate
locations where sections BD were obtained. BM, basement membrane; C,
corneal facet lens; CC, crystalline cone; PPC, primary pigment cell; Pr,
photoreceptor; Rh, rhabdom; SPC, secondary pigment cell; TC, tracheal cell.
(B) Cross section through the distal portion of the retina. The pigment cells
(black arrowheads) were labeled. Photoreceptors (white arrowheads) were not
labeled. Non-immune serum gave no labeling (inset). (C) Transverse section
through the proximal part of the retina. The secondary pigment cells (black
arrowheads) were labeled, but no photoreceptors were labeled. (D) Longitudinal
section around the basement membrane (BM). The tracheal cells (white
arrowheads) as well as the secondary pigment cells (black arrowheads) were
strongly labeled. Scale bars, 30 µm.