In online databases the letter sequence of the word is researched.

The protein Database (www.pdb.org) contains structural 3D data of molecules (proteins and nucleic acids) and is under free access to do scientific work.

Since 2008 each letter of the alphabet has its equivalent in the scientific based presentation of proteins.

PEPTOMICS developed a basic visualisation of each letter representing an amino acid so far.

 

Amino Acid	3-Letter Code	1-Letter Code
Alanine	Ala	A
Asparagine or Aspartic acid *	Asx	B
Cysteine	Cys	C
Aspartic acid	Asp	D
Glutamic acid	Glu	E
Phenylalanine	Phe	F
Glycine	Gly	G
Histidine	His	H
Isoleucine	Ile	I
Leucine or Isoleucine*	Xle	J
Lysine	Lys	K
Leucine	Leu	L
Methionine	Met	M
Asparagine	Asn	N

Amino Acid	3-Letter Code	1-Letter Code
Pyrrolysine	Pyl	O
Proline	Pro	P
Glutamine	Gln	Q
Arginine	Arg	R
Serine	Ser	S
Threonine	Thr	T
Selenocysteine	Sec	U
Valine	Val	V
Tryptophan	Trp	W
Unspecified or unknown Amino Acid *	Xaa	X
Tyrosine	Tyr	Y
Glutamine or glutamic acid *	Glx	Z

* ambiguous Amino Acid

EACH LETTER REPRESENTS THE ATOMIC 3D POSITION OF AN AMINO ACID.