Figure 15

Frequency histograms of intron numbers in all 52 GNB genes examined. After we identified the G-protein beta AA sequences and obtaining the trees, we retrieved all respective genomic sequences from the databases. And the exon intron junctions, the length of introns, and the numbers of intron insertions within coding regions were inferred, and listed in Additional file 8 [see Additional file 8]. Figure A and B represents the histograms of intron insertion numbers within coding regions for two major groups of vertebrate GNBs, that is, GNB 1 to 4 and GNB 5 groups, respectively. Anamniotic vertebrates mean fish and amphibian, and amniotic birds and mammals. Abscissa, Intron numbers. Ordinate, and Number of genes, which showed the numbers of intron insertions in the coding regions as indicated on the abscissa. Figure C and D is the similar histogram for two major groups of GNBs genes of the protostomic clades, that is, Caenorhabditis elegans and brigssae, and Drosophila melanogaster and Anopheles gambiae. Extra means Gbeta76C genes of Drosophila and Anopheles.