Categories of features for Dicer site prediction.

aSub-vector of 36 variables standing for the size of internal loops in the candidate mature sequence region in cases that unpaired nucleotides on the 5′ arm varies within 1–6 nt and unpaired nucleotides on the 3′ arm varies within 1–6 nt;bSub-vector of 4 variables, including the number of bulges and the number of unpaired nucleotides involved in the bulges on both the 5′ and 3′ arms;cThe position of the first paired nucleotides from the non-loop side of the secondary structure of pre-microRNA;dThe number of nucleotides between the 5′ end and the candidate Dicer processing site.