Neutral lysine can be written HL. The other forms of lysine are H 3 L 2+ ,
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Neutral lysine can be written HL. The other forms of lysine are H3L2+, H2L+, and L+. The isoelectric point is the pH at which the average charge of lysine is 0. Therefore, at the isoelectric point, 2[H3L2+] + [H2L+] = [L+]. Use this condition to calculate the isoelectric pH of lysine.
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