Figure 4. Phylogenetic analysis reveals six kinds of BG genes in the B12 haplotype: The two singletons each separately, and the twelve BG genes of the BG region in four groups indicating the presence of hybrid genes.

Left, relationships of whole BG gene sequences (from 500 bp upstream to near the end of the 3′UTR as determined by the predicted polyadenylation site) as assessed by phylogenetic analysis (numbers at nodes indicate boot strap values determined from 1000 replicates). Right, relationships of different regions of BG genes indicated by colour, as determined by separate phylogenetic analyses in Figure 5.