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The transverse distribution of calcium across median slices was measured in Cox's Orange Pippin apples with breakdown and in sound fruit from the same sources removed at the same time from stores held at 3°C. In addition to usually having a lower average calcium concentration in the slice, every apple with breakdown had a lower proportion of calcium in the core zone than the average proportion for the sound fruit.
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Perring et al. (1985) studied this question.
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