Describe the isoelectric point. With the help of an example explain the utility of this property of amino acids and how is it useful in maintaining pH in human systems.

The isoelectric point (pI) of an amino acid is the pH at which the molecule has no net electrical charge. At this point, the amino acid exists as a zwitterion, meaning it has both positive and negative charges that balance each ____ ______ ____ ________ _________ ______.
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