IUPAC codes for amino acids:

1-Letter Code 3-Letter Code Amino Acid
A Ala Alanine
B Asx Aspartic Acid or Asparagine
C Cys Cysteine
D Asp Aspartic Acid
E Glu Glutamic Acid
F Phe Phenylalanine
G Gly Glycine
H His Histidine
I Ile Isoleucine
J Xle Leucine or Isoleucine
K Lys Lysine
L Leu Leucine
M Met Methionine
N Asn Asparagine
O Pyl Pyrrolysine
P Pro Proline
Q Gln Glutamine
R Arg Arginine
S Ser Serine
T Thr Threonine
U Sec Selenocysteine
V Val Valine
W Trp Tryptophan
X Xaa Unspecified or unknown
Y Tyr Tyrosine
Z Glx Glutamic Acid or Glutamine

IUPAC codes for nucleotides:

Symbol Description Bases Represented
A adenosine/adenine A
C cytidine/cytosine C
G guanosine/guanine G
T thymidine/thymine T
U uridine/uracil U
W weak A T
S strong C G
M amino A C
K keto G T
R purine A G
Y pyrimidine C T
B not A C G T
D not C A G T
H not G A C T
V not T A C G
N or - any base (not a gap) A C G T

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