L-methionine (M)

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Some facts on L-methionine.

1. Abbreviation: Met.
2. One-letter code: M.
3. Molecular mass: 149 daltons.
4. Side chain (or R-group) features:
   • Structural formula:
     
   • Formula: -(CH₂)₂-S-CH₃;
   • Category: hydrophobic; neutral.
   • pK_a: none.