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Phased small interfering RNA (phasiRNA) and trans-acting simple interfering RNA (tasiRNA) biogenesis pathways in maize. (A) The 21 nt phasiRNA biogenesis pathway. (B) The 24 nt phasiRNA biogenesis pathway. The regulatory mechanism of 24 nt has not been fully uncovered. (C) TAS3-tasiRNA biogenesis pathway.
