Phylogenetic tree and domain composition of JMJ-only and KDM4 proteins. Bayesian phylogenetic tree of JMJ-only (A) and KDM4 (B) predicted proteins from Arabidopsis thaliana (At), Oryza sativa (Os), Solanum lycopersicon (Sl) and Zea mays (Zm). Bootstrap values higher than 50% are shown. The tree is drawn to scale, with branch lengths measured in the number of substitutions per site. JmjC domain (PF02373) is the conserved domain of the JMJs-only class; N-terminal JmjN (PF02375) and JmjC, and C-terminal C5HC2 (PF02928) (subgroup I) or C2H2 (PF00096) (subgroup II) domains are conserved domains of KDM4 proteins.