4QZV:
reference: Bat origins of MERS-CoV supported by bat coronavirus HKU4 usage of human receptor CD26., Wang Q, Qi J, Yuan Y, Xuan Y, Han P, Wan Y, Ji W, Li Y, Wu Y, Wang J, Iwamoto A, Woo PC, Yuen KY, Yan J, Lu G, Gao GF, Cell Host Microbe. 2014 Sep 10;16(3):328-37. doi: 10.1016/j.chom.2014.08.009. PMID: 25211075

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