Amino Acids

#	Code	Three-letter Code	Meaning
1	A	Ala	Alanine
2	C	Cys	Cysteine
3	D	Asp	Aspartic acid
4	E	Glu	Glutamic acid
5	F	Phe	Phenylalanine
6	G	Gly	Glycine
7	H	His	Histidine
8	I	Ile	Isoleucine
9	K	Lys	Lysine
10	L	Leu	Leucine
11	M	Met	Methionine
12	N	Asn	Asparagine
13	P	Pro	Proline
14	Q	Gln	Glutamine
15	R	Arg	Arginine
16	S	Ser	Serine
17	T	Thr	Threonine
18	V	Val	valine
19	W	Trp	Tryptophan
20	Y	Tyr	Tyrosine
21	B*	Asx	Aspartic acid (D) or Asparagine (N)
22	U*	Sec	Selenocysteine
23	X*	Xaa	Unspecified or unknown
24	Z*	Glx	Glutamic acid (E) or Glutamine (Q)
25	J*+	Xle	Isoleucine (I) or Leucine (L)
26	O*+	Pyl	Pyrrolysine

#	Code	Meaning	Complement
1	A	Adenine	T
2	C	Cytosine	G
3	G	Guanine	C
4	T/U	Thymine/Uracil	A
5	M (aMino)	A/C	K
6	R (puRine)	A/G	Y
7	W (Weak)	A/T	W
8	S (Strong)	C/G	S
9	Y (pYrimidine)	C/T	R
10	K (Keto)	G/T	M
11	V (not T)	A/C/G	B
12	H (not G)	A/C/T	D
13	D (not C)	A/G/T	H
14	B (not A)	C/G/T	V
15	N (aNy)	G/A/T/C	N

• Source for Nucleotides:
  • http://droog.gs.washington.edu/parc/images/iupac.html


• Source for Amino acids:
  • Mostly from this DNASTAR page, cross-checked with this page from Queen Mary University of London.
  • *: Amino acids outside the most common 20 ones.
  • +: May not be IUPAC standard yet according to this page