The Twenty

Atlas/Arg

R

Arginine

Arg

BasicNon-essentialHydrophilicSide-chain pKa 12.5156 Da

Guanidino

  • The most basic residue (guanidino pKa ≈ 12.5).
  • Conditionally essential in humans; always charged in proteins.

Mastery: unseen

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Structure of Arginine
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