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The number of precursor miRNA (pre-miRNA) sequences identified for each miRNA family in (a) rare miRNA family group, (b) moderately conserved miRNA families group, (c) highly conserved miRNA families group, and (d) common miRNA families group are shown. Each bar indicates both repetitive pre-miRNAs, defined as containing repetitive elements for more than half of their lengths, with the light shade of gray, and non-repetitive pre-miRNAs with the dark shade of gray.
