Superfamily: CAD & PB1 domains [54277]
contain extra helix; similar heterodimerization modes; possibly related to the ubiquitin-like superfamily uperfamily
Family: PB1 domain [64225]
Pfam 00564 forms heterodimers, although not all PB1 domain pairs associate.
Protein: Mitogen-activated protein kinase kinase kinase 2, MEKK 2 [142976]