A schematic illustration summarizes the biogenesis regulators of specific miRNAs, with positive regulators on the left and negative regulators on the right (26, 50, 87, 92, 89, 144, 145, 98, 97, 91, 146, 147, 94, 96, 93, 148–152, 90, 153–158, 88, 95, 159, 160). miRNAs whose biogenesis is controlled by each regulator also are listed.