A summary article said that this is a known protein that helps the virus evade the host immune system, and that a similar mutation in SARS-COV-1 resulted in a less virulent infection.
I was wondering if the scientists could comment on this rapid-release paper https://jvi.asm.org/content/jvi/early/2020/04/30/JVI.00711-20.full.pdf
The paper is not easy for me to read. A deletion of 27 amino acids was observed in a patient. Perhaps the scientists could comment on the resulting structural change?