4UX3:
reference: Closing the cohesin ring: structure and function of its Smc3-kleisin interface., Gligoris TG, Scheinost JC, Burmann F, Petela N, Chan KL, Uluocak P, Beckouet F, Gruber S, Nasmyth K, Lowe J, Science. 2014 Nov 21;346(6212):963-7. doi: 10.1126/science.1256917. PMID: 25414305

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