5X6O:
reference: 3.9 A structure of the yeast Mec1-Ddc2 complex, a homolog of human ATR-ATRIP., Wang X, Ran T, Zhang X, Xin J, Zhang Z, Wu T, Wang W, Cai G, Science. 2017 Dec 1;358(6367):1206-1209. doi: 10.1126/science.aan8414. PMID: 29191911

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