Amino Acid Single-Letter Codes and Properties

Alanine (Ala)

A - Hydrophobic, Most Common, Small

Arginine (Arg)

R - Hydrophilic, Polar Positive

Asparagine (Asn)

N - Hydrophilic, Polar Uncharged, Small

Aspartic Acid (Asp)

D - Hydrophilic, Polar Negative, Small

Cysteine (Cys)

C - Hydrophobic, Least Common, Small

Glutamic Acid (Glu)

E - Hydrophilic, Polar Negative

Glutamine (Gln)

Q - Hydrophilic, Polar Uncharged, Small

Glycine (Gly)

G - Hydrophobic, Most Common, Small

Histidine (His)

H - Aromatic, Hydrophobic, Least Common, Polar Positive

Isoleucine (Ile)

I - Aliphatic, (Most) Hydrophobic

Leucine (Leu)

L - Aliphatic, (Most) Hydrophobic, Most Common

Lysine (Lys)

K - Hydrophobic, Polar Positive

Methionine (Met)

M - Hydrophobic, Least Common

Phenylalanine (Phe)

F - Aromatic, Hydrophobic

Proline (Pro)

P - Small

Serine (Ser)

S - Hydrophilic, Most Common, Polar Uncharged, Small

Threonine (Thr)

T - Hydrophobic, Polar Uncharged, Small

Tryptophan (Trp)

W - Aromatic, Hydrophobic, Least Common, Polar Uncharged

Tyrosine (Tyr)

Y - Aromatic, Hydrophobic, Polar Uncharged

Valine (Val)

V - Aliphatic, (Most) Hydrophobic, Small