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Description:
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• First recovered as an Mc on an Ag chromosome. The two genes later segregated away from each other.
• The male first recovered was F1 of Ag/Es.
• Head is reduced posterior to the genal shelf. Most of the dorsal component of the eye is missing. Ventral expression of eye is more complete, though somewhat reduced due to a reduction of that portion of the head capsule itself. In contrast to Ey, Er most often has good bilateral expression of the ventral eye.
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