. "\"The initiation of the activity of the inactive enzyme JUN kinase by phosphorylation by a JUN kinase kinase (JNKK).\" [GOC:bf]" . . "activation of JUN kinase activity" . "Reactome:REACT_25273 \"Activated TAK1 mediates Jun kinases (JNK) phosphorylation and activation, Gallus gallus\"" . . . "activation of SAPK activity" .