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. 2021 Jul 13;9:695003. doi: 10.3389/fcell.2021.695003

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Copyright © 2021 Huang, Wu, Chen, Tong, Zhou, Wu, Zhang, Yang, Ma and Du.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Transmission electron microscopy of nas-33 and gpb-1 RNA interference-treated Haemonchus contortus. (A) Cuticle structure of Bt-Cry1AC RNAi-treated worm. (B) Two layers of cuticles of nas-33 RNAi-treated worm. (C) Loose connection between cuticle and epidermis in gpb-1 RNAi-treated worm. (D) Two layers of cuticles and loose connection between cuticle and epidermis of nas-33 and gpb-1 RNAi-treated worm. L1C, L1 cuticle; L2C, L2 cuticle. Black arrows point to the loose connections between cuticle and epidermis. Scale bar: 0.5 μm.