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Six different protonation states of the amino acid lysine are shown below.
The pKa of the carboxylic acid group is 2.2. The pKa of the protonated α-amine is 9.0. The pKa of the protonated side chain amine is 10.5.
Choose the structure that represents the main form of lysine found in your blood, which is buffered at a pH of 7.4.