GeBP and GeBP-like proteins are noncanonical leucine-zipper transcription factors that regulate cytokinin response in Arabidopsis.
Chevalier F, Perazza D, Laporte F, Le Hénanff G, Hornitschek P, Bonneville JM, Herzog M, Vachon G. Plant Physiol. 2008 Mar; 146(3):1142-54. Epub 2007 Dec 27.