List of Natural Amino Acids

Amino Acid	Three-letter	One-letter	AA Mol. Mass	Formula	Residue Mass	Residue Formula	Property
Alanine	Ala	A	89.09	C3H7NO2	71.08	C3H5NO	Neutral, hydrophobic
Arginine	Arg	R	174.20	C6H14N4O2	156.19	C6H12N4O	Basic, hydrophilic
Asparagine	Asn	N	132.12	C4H8N2O3	114.10	C4H6N2O2	Neutral, hydrophilic
Aspartic Acid	Asp	D	133.10	C4H7NO4	115.09	C4H5NO3	Acidic, hydrophilic
Cysteine	Cys	C	121.16	C3H7NO2S	103.14	C3H5NOS	Thiol; easily oxidized
Glutamine	Gln	Q	146.14	C5H10N2O3	128.13	C5H8N2O2	Neutral, hydrophilic
Glutamic Acid	Glu	E	147.13	C5H9NO4	129.11	C5H7NO3	Acidic, hydrophilic
Glycine	Gly	G	75.07	C2H5NO2	57.05	C2H3NO	Neutral, hydrophobic
Histidine	His	H	155.15	C6H9N3O2	137.14	C6H7N3O	Basic, hydrophilic
Isoleucine	Ile	I	131.17	C6H13NO2	113.16	C6H11NO	Neutral, hydrophobic
Leucine	Leu	L	131.17	C6H13NO2	113.16	C6H11NO	Neutral, hydrophobic
Lysine	Lys	K	146.19	C6H14N2O2	128.17	C6H12N2O	Basic, hydrophilic
Methionine	Met	M	149.21	C5H11NO2S	131.20	C5H9NOS	Easily oxidized
Phenylalanine	Phe	F	165.19	C9H11NO2	147.18	C9H9NO	Neutral, hydrophobic
Proline	Pro	P	115.13	C5H9NO2	97.12	C5H7NO	Neutral, hydrophilic
Serine	Ser	S	105.09	C3H7NO3	87.08	C3H5NO2	Neutral, hydrophilic
Threonine	Thr	T	119.12	C4H9NO3	101.10	C4H7NO2	Neutral, hydrophilic
Tryptophan	Trp	W	204.23	C11H12N2O2	186.21	C11H10N2O	Neutral, hydrophobic
Tyrosine	Tyr	Y	181.19	C9H11NO3	163.17	C9H9NO2	Neutral, hydrophobic
Valine	Val	V	117.15	C5H11NO2	99.13	C5H9NO	Neutral, hydrophobic

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