This domain is named RWP-RK after a conserved motif at the C terminus of the presumed domain. The domain is found in algal minus dominance proteins as well as plant proteins involved in nitrogen-controlled development [1].

1: A plant regulator controlling development of symbiotic root nodules. Schauser L, Roussis A, Stiller J, Stougaard J; Nature 1999;402:191-195. PMID:10647012