8) SARS-CoV-2 is the only one of more than 100 known SARS-like coronaviruses that contains an FCS. This is a feature that does not rule out a natural origin, but that is more easily explained by a lab origin. Especially since insertion of FCS had been explicitly proposed in 2018.

— Richard H. Ebright (@R_H_Ebright) September 5, 2022