Fig. 2From: Horizontal transfer of β-carbonic anhydrase genes from prokaryotes to protozoans, insects, and nematodesPhylogenetic analysis of clade a, b, c, and d of β-CA protein sequences. Eukaryotic hosts and tentative prokaryotic endosymbionts are pinpointed in red and blue boxes, respectively. The green diamonds at internal nodes represent common ancestors which have both bacterial and eukaryotic descendants, and identify the possible pathways of β-CA HGT from common bacterial sources to protozoan, insect, and nematode species. The plausible HGT of β-CA genes from tentative prokaryotic endosymbionts to eukaryotic hosts are shown by purple arrows and by indicating names of the donor and acceptor speciesBack to article page