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CORD-19:113f9670b9a495a6352bc03bf2d923e60fa41b7d
> spans
> 21027-21132
CORD-19:113f9670b9a495a6352bc03bf2d923e60fa41b7d
/ 21027-21132
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The acquisition of combinations of mutations may be required for viruses to advance through this process.