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Fig. 5 | BMC Evolutionary Biology

Fig. 5

From: Tracing the evolution of the heterotrimeric G protein α subunit in Metazoa

Fig. 5

Evolution of Gαv. a A schematic representation of the conserved exon-intron structure of Gnathostomata, Cephalochordata, Porifera and Ctenophora (pre)GNAV genes with 9 protein-coding exons (grey boxes). Box sizes roughly correlate with exon size, while line lengths do not correlate to intron size. b The exon-intron structure of Filasterea, Cnidaria, Echinodermata and Hemichordata preGNAV genes. This preGNAV has no intron to divide exon7 and 8, making its exon-intron structure closely akin to (pre) GNAI (blue boxes) and (pre) GNAQ (orange boxes) exon-intron structures. This may represent an ancestral exon-intron structure of preGNAV

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