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Classification and origins of T2Rs in chemosensory GPCR families. (A) A schematic illustration of the phylogeny, structures, and ligands of chemosensory GPCR families. The GPCR family classification and phylogeny refer to GPCRdb and several literature sources [22,23,24,25]. (B) The evolutionary origins of chemosensory GPCR families in Chordata. The animal silhouettes are retrieved from Phylopic (https://www.phylopic.org/, accessed on 28 May 2024).
