Side chain polarity Reset Display the side chain amino group as Ball & Stick. Add a distance measure (in Å units). Some facts on L-lysine. Abbreviation: Lys. One-letter code: K, (near L). Molecular mass: 146 daltons. Side chain (or R-group) features: Structural formula: Formula: -(CH2)4-NH3+; Category: polar; basic. pKa: 10.5. Return to image of Lys.
Some facts on L-lysine.