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Which of the following modifications to amino acids would increase the net charge of the most positive molecule at physiological pH? a. Histidine to histamine

Which of the following modifications to amino acids would increase the net charge of the most positive molecule at physiological pH?

a. Histidine to histamine

b. Proline to 4-hydroxyproline

c. Glutamic acid to polyglutamic acid

d. Cysteine to n-acetylcysteine

e. None of the above

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