All 20 Standard Amino Acids

Complete reference: 1-letter and 3-letter codes, molecular weight, monoisotopic mass, pKa, Kyte-Doolittle hydrophobicity index, and key facts.

1-let. 3-let. Name Class Avg MW Mono MW Residue MW pKa KD Codons
ℹ️ Average MW from IUPAC 2021. Monoisotopic masses from NIST. Kyte-Doolittle scale: Kyte J, Doolittle RF. J Mol Biol. 1982;157(1):105-32. pKa: Pace CN et al. Protein Science. 2009.