Table 2.

The optimal site feature set

	Feature		Feature
1	6mer seed match	11	Number of matches in total region
2	Conservation score of 3' context region	12	Binding energy of seed region
3	Number of matches in seed region	13	Seed conservation score
4	7mer_A1 seed match	14	p7 match status
5	7mer_m8 seed match	15	Context nt type of r1
6	7mer_m1 seed match	16	Binding energy of total region
7	8mer_A1 seed match	17	conservation score of 5' context region
8	Accessibility energy	18	Number of mismatches in seed region
9	8mer_m1 seed match	19	p5 match status
10	6th 2mer status	20	p2 match status
		21	p12 match status