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Knockdown of nas-33 leads to molting defects in Haemonchus contortus. (A–D) Defects in the first molting of H. contortus led to larva death. (E,F) Defects in the first molting of H. contortus resulted in attachment of the old cuticle to the second stage larva. Cuticles failed to be shed are marked with white arrows. (G,H) Phenotype of untreated larvae of H. contortus.
