> The DARPA proposal stated that scientists would introduce furin cleavage sites into lab-created versions of SARS-related coronaviruses, recovered from bats in

> The DARPA proposal stated that scientists would introduce furin cleavage sites into lab-created versions of SARS-related coronaviruses, recovered from bats in Yunnan. > SARS-CoV-2 is the only virus known to possess a furin cleavage site in its section of the coronavirus family tree. “We now know that there are full-length bat CoVs similar to SARS-CoV-2 that bind well to human ACE2,” Bloom said, referring to the Laos viruses, “but only lack the furin cleavage site.” Yikes.