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Chloroplast DNA levels in ZmWhy1 mutants. Seedling leaf DNA (5 µg) was digested with EcoRI (left), or PvuII (right) and analyzed by DNA gel blot hybridization using a probe from the chloroplast rrn23 gene (top left), or orf99 (top right). The same gels stained with ethidium bromide are shown below. The small fluctuations in relative band intensity may result from small differences in sample loading.
