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. 2020 Aug 10:1–15. doi: 10.1080/07391102.2020.1804460

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Figure 1. — Tertiary structures of the S-protein of human coronaviruses. The S-proteins have a similar Y-shaped tertiary structure. The three arms of the S-protein is represented by A, B, and C. Arm A is the receptor-binding domain and arm C is the C-terminal transmembrane and cytoplasmic domain. Red colour represents α-helix, blue colour represents β-sheets, green colour represents turns, and white colour represents coils and loops. (a) 229E CoV, (b) NL63 CoV, (c) OC43 CoV, (d) KU1 CoV, (e) MERS CoV, (f) SARS CoV, and (g) SARS CoV-2.