Figure 4. Horizontal gene transfer of two domains, (A) the glycosyltransferase 28 domain and (B) the glycosyltransferase sugar-binding region, among three different kingdoms.

The amino acid sequences for the glycosyltransferase 28 domain and the glycosyltransferase sugar-binding region and the corresponding rRNA sequences from the various species representing three different kingdoms (plants in green, fungi in brown, and bacteria in blue) were used. Predicted HGTs are represented by arrows from the original species to the recipient species. The detection of HGT was based on the 16S rRNA sequences of various species.