Fig. 3.

Rh and Amt are distantly related families but have gone through divergent and independent evolution. a The maximum likelihood (ML) joint tree of 111 Rh proteins (red) and 260 Amt (blue) proteins. Bacterial NeRh and archaeal FaAmt and TvAmt are at the base of the respective families. b The ML joint protein tree of 18 Rh and 30 Amt in species that harbor both types of genes. The values at nodes are the bootstrap proportion from ML. This expanded analysis covers species from bacteria to invertebrates