Figure 3

Maximum-likelihood phylogeny of amidase protein sequences. The maximum-likelihood phylogeny was reconstructed using the protein sequences from the amidase domains of the urea amidolyase proteins and the amidase proteins. The numbers above or below the internal branches show bootstrap values (%). Only bootstrap values equal to or higher than 70% are shown. Branches are colored as follows: blue for fungi, green for green algae, and red for bacteria. The bacterial urea carboxylase forms two separate groups denoted by A1 and A2. See Additional files 1, 4, and 7 for the sequence sources.