Assertion: watermelon | /r/MadeOf | amino acid citrulline
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Source sentences:
text: The watermelon rind is supposed to be a natural form of viagra as watermelon contains amino acid citrulline, which helps to boost the libido.
text: What's more, watermelon also contains the amino acid citrulline, which potentially increases nitric oxide levels, which in turn dilates your blood vessels.