(+) density				(−) density
	bu	pb	ex		bu	pb	ex
Asp	0.93	1.02	0.63	Asp	0.59	0.47	0.34
Glu	0.97	1.12	0.65	Glu	0.63	0.43	0.32
Arg	0.67	0.49	0.30	Arg	1.25	1.20	0.82
Lys	0.44	0.35	0.23	Lys	1.17	1.04	0.69