Correlation coefficients and significant values (P values) of miRNA conservation and sequence features (F1-F12) in six species. Features F1–F4 are the base contents of A, C, G, and U of miRNA precursors.

Features F5–F8 are the base contents of A, C, G, and U of mature miRNAs. Features F9–F12 are the base contents of A, C, G, and U of non-mature sequences. Correlation analysis was performed for each miRNA feature and miRNA conservation for each species. The numbers in each cell mean the correlation coefficient and p value of the correlation analysis.