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Ultrastructural analysis of photoreceptor connecting cilia by transmission electron microscopy. (A, B). Horizontal sections through photoreceptors of wild-type and arl13b−/− larvae at 5 dpf show the connecting cilia in the vicinity of the mitochondria (M). Calyceal processes surround the cilium (arrows). (C, D) Higher magnification images revealed no obvious defects in microtubule organization in arl13b−/− mutants. Scale bars: 0.5 μm (A, B) and 0.2 μm (C, D).
