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Histidine has three pKa values of 1.82,6.00, and 9.17. Which one of the following is the correct protonation state of histidine at pH 4.5 ?

Histidine has three pKa values of 1.82,6.00, and 9.17. Which one of the following is the correct protonation state of histidine at pH 4.5 ? Selected Answer: B.image

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