The pattern of polymorphisms in the target and nontarget genes of miRNAs in Arabidopsis thaliana. (A) Density distribution of nucleotide diversity π. Filled stars and open diamonds are for target and nontarget genes, respectively. The genomic average is shown by a dashed line. (B) Density distribution of Tajima's D statistic. (C) Frequency distribution of minor allele frequencies. Filled and open bars are for target and nontarget genes, respectively.