Figure 6. The RIPK gene family evolved through a series of gene duplication events.
The reconstructed phylogeny was generated by the Ensembl genome browser (183). Internal nodes correspond to key speciation (purple) and gene duplication (red) events. Branch lengths correspond to rates of evolutionary change. ANKK1 (ankyrin repeat and protein kinase domain-containing protein 1) does not function as a RIP kinase but is closely related to RIPK4 and other RIPKs.