Illustration of the features used to describe positive and negative miRNA samples.

The figure shows a 5′ mature miRNA sample (in red) and the associated flanking regions (in green). Examples of sequence and structural information for certain positions in the mature miRNA as well as the flanking regions are also depicted. The distance feature, measuring the number of nucleotides from the start position of the mature miRNA until the start of the closest hairpin is indicated on top.