[graeme]

SARS-COV-1 also used ACE2 receptors. In fact your article specifically discusses that, and suggests there was potential to use SARS-COV-1 vaccine development to create SARS-COV-2 vaccines.

The ACE2 receptor affinity is not novel.

[thowaway959125]

Sort of. Very different without getting into the weeds.

https://www.nature.com/articles/s41392-020-0184-0