Correlations between the number of Dicer genes a species has and the miRNA sequence features among the six species, including the content difference of the base U fraction at the 5′ end for conserved miRNAs and less-conserved miRNAs (A) and length range of mature miRNAs (B).

<p>Correlations between the number of Dicer genes a species has and the miRNA sequence features among the six species, including the content difference of the base U fraction at the 5′ end for conserved miRNAs and less-conserved miRNAs (A) and length range of mature miRNAs (B).