Known miRNAs from sweet orange ( Citrus sinensis ), designated as csi on the first column, and their homologs in other plant species. The picture is modified from Axtell et al. . Scale 0, miRNA only predicted; scale 1, miRNA sequenced; scale 2, miRNA/miRNA* accumulation detected; scale 3, miRNA detected by small RNA blot or qRT-PCR; scale 4, miRNAs with validated targets. The general information is based on miRBase 13.0 statistics. Abbreviations: ath, Arabidopsis thaliana; bna, Brassica napus; csi, Citrus sinensis; eca, Eschscholzia californica; mtr, Medicago truncatula; osa, Oryza sativa; pta, Pinus taeda; ptc, Populus trichocarpa; ppt, Physcomitrella patens; sly; Solanum lycopersicum; vvi, Vitis vinifera; zma, Zea mays. Some of the data is renewed with information from publications including Arabidopsis [24, 62], California poppy , grape , rice , and tomato [23, 55].