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Sequence alignments among different miR399 species and five potential targets on PHO2 mRNA (A) and the mimicked target sequence on At4/IPS1 noncoding RNAs (B). Mismatched nucleotides are indicated in bold and GU base-pairings are marked in gray. The position of nucleotide 13 is highlighted. Solid triangles indicate the cleavage sites of target sequences by miR399s.
