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Does the central part of watermelon or banana have a higher concentration of sugar (fruit-sugar or saccharobiose)?

The center of the fruit is sweeter than other red parts of watermelon. enter image description here

In bananas, the central part is also sweeter and looks sugary too.

enter image description here

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In my personal exprience, too, watermelon is sweeter near its symmetry axis. I can't think of anything else as an explanation but having somewhat higher sugar concentration there. –  winerd Jun 15 '13 at 22:26

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