Table 1.

A summary of residue features.

Type	Context len.	# of Features
Residues	3	${20}^3$
	5	${20}^5$
Simplified alphabets (10 groups)	5	${10}^5$
	7	${10}^7$
Simplified alphabets (4 groups)	5	$4^5$
	7	$4^7$
Secondary structures	3	$8^3$
	5	$8^5$