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The 20 biological amino acids
Aliphatic nonpolar side chains:
Glycine
Gly
G
Valine
Val
V
Alanine
Ala
A
Isoleucine
Ile
I
Aliphatic polar side chains:
Proline
Pro
P
Leucine
Leu
L
Aromatic side chains:
Phenylalanine
Phe
F
Threonine
Thr
T
Asparagine
Asn
N
Glutamine
Gln
Q
Sulfur containing side chains:
Tryptophan
Trp
W
Tyrosine
Tyr
Y
Basic side chains:
Lysine
Lys
K
Serine
Ser
S
Methionine
Met
M
Cysteine
Cys
C
Acidic side chains:
Histidine
His
H
Arginine
Arg
R
Glutamic acid
Glu
E
Acidic and basic groups are shown in their ionized form. ©2007 Peter A. Doucette
Aspartic acid
Asp
D
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