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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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closed as too broad by Chris, Bez, GriffinEvo, MattDMo, WYSIWYG Dec 8 at 4:42

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

    
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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