Fig. 2
From: Massive expansion and diversity of nicotinic acetylcholine receptors in lophotrochozoans
Evolution of nAChR gene families. a Phylogenetic tree of 644 nAChR genes with the typical LBD-NTM domain structure (without other functional domains) from nine species. The number of nAChR families is in green, and the number of nAChR genes is in red. MRCA represents the most recent common ancestor. b Phylogenetic tree of Family 3832 with the number of nAChR genes in red. Cgi: C. gigas, Pma: P. f. martensii, Lgi: L. gigantea, Aca: A. californica, Obi: O. bimaculoides, Hro: H. robusta, Cte: C. teleta, Dre: D. rerio and Hsa: H. sapiens