A proteinogenic amino acid represented by K or Lys in protein primary structure. Its amino acid side chain carries predominantly positive electric charge near neutral pH.[ref]
26.1 Structures of Amino Acids. Organic Chemistry by John McMurry; Table 26.1, lysine and arginine rows; side-chain protonation at pH 7.3
Trypsin preferentially cleaves after its amino acid residues.
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