Researchers describe a recently identified bat coronavirus that contains insertions of amino acids at the junction of the S1 and S2 subunits of the virus's spike protein in a manner similar to SAR-CoV-2. While it's not a direct evolutionary precursor of SARS-CoV-2, this new virus, RmYN02, suggests that these types of seemingly unusual insertion events can occur naturally in coronavirus evolution.
from Health & Medicine News -- ScienceDaily https://www.sciencedaily.com/releases/2020/05/200511142202.htm
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