The phylogenetic maximum likelihood tree of the nAChR genes in nexus format. The tree topology is supported by a non-parametric Ultra-Fast Bootstrap (UFBoot) and approximate Likelihood-Ratio Test (aLRT) with 1000 replicates. For simplicity only UFBoot values are shown. The taxa ID contains the species, the localization of the gene (chromosome/scaffold/contig number) and a number indicating the order on the chromosome/scaffold/contig if several genes are located on the same one. The taxa ID of human and zebrafish genes with annotated HGNC or ZFIN names, respectively, also contain these names. The assigned taxa ID and sequence information details are provided in Additional file 4
