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Fig. 1. Enhancer trap lines showing marginal pigmentation in the fly eye.
(A) Schematic depiction of the peripheral specializations of the eye.
Residing immediately adjacent to the head capsule (blue) is the pigment rim
(red) that completely circumscribes the eye. The dorsal rim ommatidia (green)
lie next to the pigment rim only in the dorsal margin of the eye. The dorsal
rim ommatidia and their ventral corresponding ommatidia, together with a
number of interior rows of ommatidia (white), are devoid of bristles. The
central field of ommatidia (light blue) bears bristles. Shown within the
dorsal and ventral boxed areas are the photoreceptor-bearing ommatidia. The
outer photoreceptors extend throughout the entire ommatidium, whereas the
inner photoreceptor R7 and R8 each occupies half of the ommatidium (black
bars). Inner photoreceptors of the dorsal rim ommatidia have enlarged
rhabdomeres (pink bars) when compared with those of normal ommatidia.
(B-D) Whole-mount views of the adult eyes of RR (B), Cir1 (C) and SK
(D) showing marginal pigmentation pattern. The pigmentation deceptively
appears to extend well into the body of the eye. This results from the cupped
shape of the retina. Compare arrow in B with arrow in E. (E) Section
through the anterior region of the eye of Rim Red showing pigment expression
only in the pigment rim. The arrow indicates the pigment in the PR, and the
corresponding position is indicated in B above. (F) Genomic map of the
Snail region. The red arrowheads indicate the positions of the three P-element
insertions.
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