Stick model of L-arginine (R).
Back to Question 10.

1. Abbreviation: Lys.
2. One-letter code: K, near L.
3. Molecular mass: 146 daltons.
4. Side-chain (or R-group) features:
   • Formula: -(CH₂)₄-NH₃⁺;
   • Category: Very hydrophilic, positively charged;
   • pK_a: 10.4.

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