Biogenesis of MITE-miRNAs through a transposition–transcription process. (A) Bar chart showing the proportions of MITE-miRNAs, LTR-miRNAs, and TID-miRNAs located in exons, introns, promoters, and intergenic regions. Data are mean ± SD from 15 species. Different letters denote groups with significant differences (independent samples t-test, P < 0.05). (B) Gene structure of MIR437 family and its host genes in Sorghum bicolor. Exons are represented by shaded boxes, UTRs by open boxes, introns by horizontal lines, and intergenic regions by dot lines. Red boxes mark the position of MIR437.