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The pKa of the α-carboxyl group of methionine is 2.28, and the pKa of its α-amino...

The pKa of the α-carboxyl group of methionine is 2.28, and the pKa of its α-amino group is is 9.21. Calculate the average net charge on methionine if it is in a solution that has a pH of 8.80.

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