Motivation:Cold acclimation involves a number of different cellularprocesses that together increase the freezing tolerance of anorganism. The DREB1/CBFs are transcription factors (TFs) thatare prominent in the regulation of cold responses in Arabidopsisthaliana, rice and many other crops. We investigated if theexpression of DREB1/CBFs and co-expressed genes relies on combinatorialcontrol by several TFs. Our results support this notion andindicate that methods for studying the regulation of complexcellular processes should include identification of combinationsof motifs, in addition to searching for individual overrepresentedbinding sites.