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Aborted seed phenotypes of His auxotrophs. A, Immature silique from hisn2-1 heterozygote with mutant seeds (white, brown) arrested at a preglobular stage of embryo development. Brown seeds began to desiccate before the white seeds. B, Immature siliques from hisn8 heterozygotes showing characteristic ova phenotype (top silique, white spots in bottom valve) and partially rescued white seeds after His supplementation (bottom silique). Scale bar = 1 mm.
