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Arrested embryo phenotypes of His auxotrophs. A to E, Nomarski images of cleared mutant seeds removed from immature siliques heterozygous for hisn3-1 (A and B), hisn4-1 (C), hisn2-1 (D), and hisn6a-1 (E). F, Wild-type embryo at the heart stage of development, when all seeds were examined. Scale bar = 50 μm.
