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C Cytosine C Cys Cysteine
G Guanine D Asp Aspartic Acid
T (or U) Thymine (or Uracil) E Glu Glutamic Acid
R A or G [Either
puRine]
F Phe Phenylalanine
Y C or T [Either pYrim-
idine]
G Gly Glycine
S G or C [Three
hydrogen bond
(Strong)]
H His Histidine
W A or T [Two
hydrogen bonds
(Weak)]
I Ile Isoleucine
K G or T [Keto group in
base]
K Lys Lysine
M A or C [AMine group
in base]
L Leu Leucine
B C or G or T [Not A (B
is letter after A)]
M Met Methionine
D A or G or T [Not C] N Asn Asparagine
H A or C or T [Not G] P Pro Proline
V A or C or G [Not U in
RNA context; not T
in DNA context]
Q Gln Glutamine
N any base [A/U/G/C
in RNA context;
A/T/G/C in DNA con-
text]
R Arg Arginine
S Ser Serine
T Thr Threonine
ChemBioDraw 13.0
Chapter 5: Drawing biopolymers 71 of 401