Reference:-David Bacon and Wayne F. Anderson, "A Fast Algorithm for Rendering Space-Filling Molecule Pictures", Journal of Molecular Graphics, Vol. 6, No.4, pp.219-220, December 1988.

Amino acid	Color name	Example
ASP, GLU	bright red
CYS, MET	yellow
LYS, ARG	blue
SER, THR	orange
PHE, TYR	mid blue
ASN, GLN	cyan
GLY	light grey
LEU, VAL, ILE	green
ALA	dark grey
TRP	pink
HIS	pale blue
PRO	flesh