Copyright information:Taken from "ACRATA: a novel electron transfer domain associated to apoptosis and cancer"BMC Cancer 2004;4():98-98.Published online 29 Dec 2004PMCID:PMC546010.Copyright © 2004 Sanchez-Pulido et al; licensee BioMed Central Ltd. The tree branches for YedZ proteins are in red, STEAP branches are in yellow, and Nox branches are in violet. Organism name abbreviations are as in Fig. 1. We generated trees using a Bayesian, Neighbor Joining, and Minimum Evolution methods, and found that all three gave the same topology suggesting that the overall structure of the tree is correct. For illustrative purposes only the Neighbor Joining tree is shown [38-40].