Table 1. Assignment of axis to individual amino acids.

Axis No.	Amino acid	3-letter code	Single letter code	Axis No.	Amino acid	3-letter code	Single letter code
1	Alanine	Ala	A	11	methionine	met	M
2	Cysteine	Cys	C	12	Asparagine	asn	N
3	aspartic acid	Asp	D	13	Proline	pro	P
4	glutamic acid	Glu	E	14	Glutamine	glu	Q
5	Phenylalanine	Phe	F	15	Arginine	arg	R
6	Glycine	Gly	G	16	Serine	ser	S
7	Histidine	His	H	17	Tyrosine	tyr	T
8	Isoleucine	Ile	I	18	Valine	val	V
9	lysine	Lys	K	19	Tryptophan	trp	W
10	Leucine	Leu	L	20	Tyrosine	tyr	Y