I found some further information outside
of the study with eight participants that
suggest ace-2 is involved.
"If we think of the human body as a house and 2019-nCoV [another name for SARS-CoV-2] as a robber, then ACE2 would be the doorknob of the house's door. Once the S-protein grabs it, the virus can enter the house," Liang Tao, a researcher at Westlake University who was not involved in the new study, said in a statement."
Scientists figure out how new coronavirus breaks into human cells
https://www.livescience.com/how-coronavirus-infects-cells.html
Researchers at Westlake University Unveiled Structure of the RBD-ACE2-B0AT1 Complex
https://en.westlake.edu.cn/news_events/westlakenews/202002/t20200225_3069.shtml
"Structural basis for the recognition of the SARS-CoV-2 by full-length human ACE2"
https://science.sciencemag.org/content/early/2020/03/03/science.abb2762
Apparently, ibuprofen might increase ACE-2, so there is some chatter about that being a bad idea.
https://www.thelancet.com/action/showPdf?pii=S2213-2600%2820%2930116-8
Yes, the ACE2 receptor is how the virus gets into human cells. But, none of those papers discusses ethnic differences in ACE2 expression, which is what I haven't found any support for, and is what is behind claims it is an ethnically targeted bioweapon. It may be a bioweapon, and I'm more convinced than ever it was at least bioengineered in a lab, but that's not saying it's ethnically targeted.
Dunno if you saw it, but I posted about Shi Zhengli who tinkered with bat SARS-like viruses at the Wuhan Institute of Virology by adding the SARS ability to enter human cells with the ACE2 receptor. She also found adding chunks of HIV to them 'interesting'.
I posted about her and her work at WIV recently.
Good finds regarding ACE2 and susceptibility to SARS2.
Thanks!