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. 2021 Mar 2;12(3):209. doi: 10.3390/insects12030209

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Phylogenetic tree of odorant receptors (ORs). Red: Harmonia axyridis (Haxy); blue: Tribolium castaneum (Tcas); black: Anomala corpulenta (Acor) and Phyllotreta striolata (Pstr); green: Functionally characterized ORs of Megacyllene caryae (Mcar), Ips typographus (Ityp), and Rhyncophorus ferrugineus (Rfer). External numbers represent known groups of ORs. Numbers and symbols at nodes represent support values higher than 0.9, where 1 represents maximal support. Asterisk represents the OR with a male-biased expression.