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Putative model of a plant cohesin ring. The presumptive Arabidopsis SMC1/SMC3 cohesin complex may tether sister chromatids, and its activity may be regulated positively by CTF7 and negatively by WAPL. Other regulators are the kleisin SCC1, the subunit SCC3, cohesin regulator PDS5 and SCC2/SCC4.
