@article {6115,
	title = {A universal evolutionary index for amino acid changes},
	year = {2004},
	pages = {1548-1556},
	doi = {10.1093/molbev/msh158},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/15140949},
	author = {Hua Tang and Gerald J. Wyckoff and Jian Lu and Chung-I Wu}
}
