Encodes a microRNA that targets several genes containing NAC domains including NAC1. Overexpression leads to decreased NAC1 mRNA and reduced lateral roots. Loss of function mutants have increased NAC1 and increased number of lateral roots. MicroRNAs are regulatory RNAs with a mature length of ~21-nucleotides that are processed from hairpin precursors by Dicer-like enzymes. MicroRNAs can negatively regulate gene expression by attenuating translation or by directing mRNA cleavage.Mature sequence: UGGAGAAGCAGGGCACGUGCG. Early extra petal mutant (eep1). Pri-mRNA coordinates for MIR164c (converted to TAIR10 based on PMID19304749): Chr5: 9852483-9853314 (forward), length: 832 bp; exon coordinates: exon 1: 9852483-9853314; mature miRNA and miRNA* are located on exon 1.