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Appearance of unc-13 mutants. (A) N2 (wild-type) young adult. (B) Young adult homozygous for the severe L-region mutation e1091. (C) Young adult homozygous for the severe R-region mutation s69. (D) Recently hatched larva homozygous for the lethal mutation md2415. These animals do not grow; they barely move, and they die within a few days. Bars, 100 μm.
