Genomic annotation and size distribution of the predicted pre-miRNAs. (a-f) Pie charts represent the distribution of the pre-miRNA genomic loci on the M. truncatula genome for the conserved miRNA families (a), other known miRNA families (c), or the 52 genuine novel miRNAs (e). Numbers of miRNAs present in coding sequences (CDS), antisense to CDS, intergenic regions, and 5' UTR or 3' UTR regions of annotated transcripts are shown. Histograms represent the size distribution of the pre-miRNAs for the conserved miRNA families (b), other miRNA families (d) or the 52 genuine novel miRNAs (f). Numbers of miRNAs present in each size class are shown.