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Phylogenetic tree of ionotropic receptors (IRs). Red: Harmonia axyridis (Haxy); blue: Tribolium castaneum (Tcas); black: Ambrostoma quadriimpressum (Aqua), Anoplophora glabripennis (Agla), Dendroctonus ponderosae (Dpon), and Onthophagus taurus (Otau). Numbers and symbols at nodes represent support values higher than 0.9, where 1 represents maximal support.
