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Fig. 10 . A genetic model for the cessation of molting. We propose
that let-7 and mir-84 act through the heterochronic pathway
to repress key regulators of molting, including the conserved nuclear hormone
receptor genes nhr-23 and nhr-25. let-7 and
paralogous miRNAs might also target nhr-25 mRNA. Positive regulation
is denoted by an arrowhead and negative regulation by a perpendicular
line.