Characteristics of sRNA clusters in soybean and cucumber meiocytes. A and B, 70% and 72% of sRNA clusters found in meiocytes are meiocyte-specific in soybean and cucumber, respectively. C, sRNA cluster length in soybean and cucumber. D, sRNA cluster abundance in soybean and cucumber (**P value < 2.2e-16 from Mann–Whitney test). E, Genomic feature distributions of sRNA in soybean and cucumber. ncRNA, non-coding RNA; UTR, untranslated region.