One-Letter Amino Acid Codes
By letter By name Mnemonic
A Alanine Alanine A   
C Cysteine Arginine R Arginine
D Aspartic Acid          Asparagine N Asparagine
E Glutamic Acid Aspartic Acid D D: Aspartic Acid
F Phenylalanine Cysteine C
G Glycine Glutamic Acid E DE: the other "Acid"
H Histidine Glutamine Q "Q-tamine"
I Isoleucine Glycine G
K Lysine Histidine H
L Leucine Isoleucine I
M Methionine Leucine L
N Asparagine Lysine K KL: Lysine
P Proleine Methionine M
Q Glutamine Phenylalanine F Fenyl... Phenyl...
R Arginine Proline P
S Serine Serine S
T Threonine Threonine T
V Valine Tryptophan W "double-U": double ring
W Tryptophan Tyrosine Y Tyrosine
Y Tyrosine Valine V