Table 2 Structural features

Stem

Number of stems

Overhang

Number of overhangs

Stem_max

Length of the maximal stem in the target sequence

Loop_mismatch

Number of loops that only contain two mismatch bases

Loop_symm

Number of symmetric loops that contain more than two bases

Loop_asym

Number of asymmetric loops that contain more than two bases

Stems^a

8 features, number of stems of length 6-0 and those with length < 6 and > 10

Loops^b

8 features, the number of loops with length of 1-7 and those with length > 7

Bulges^c

8 features, number of bulges with length of 1-7 and those with length > 7