The spike protein (red) mediates the coronavirus entry into host cells. It binds to the angiotensin converting enzyme 2 (blue) through its S1 subunit and then fuses viral and host membranes through the S2 subunits.

The spike protein (red) mediates the coronavirus entry into host cells. It binds to the angiotensin converting enzyme 2 (blue) through its S1 subunit and then fuses viral and host membranes through the S2 subunits. - 140706396

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