Fig. 2
From: miRA: adaptable novel miRNA identification in plants using small RNA sequencing data
Distributions of the minimum free energy per nucleotide of the miRNA precursor secondary structure (MFE/nt), length of longest double-stranded segment within the precursor (L ds,max) and length of the precursor (L(precursor)) for known miRNA precursors in Arabidopsis thaliana (top three panels) and Chlamydomonas reinhardtii (bottom three panels). All precursor sequences were obtained from miRBase ([27]). Secondary structure calculations were performed using RNAfold ([23]). The dotted lines mark the thresholds adopted for the identification of miRNAs in the corresponding organisms