Is Asto Binding a Trait of Sarbeco R B D?

Virus that combined ace two and sars kove one have been found more widely across asia from a wider diversity of rhinolophus bats. It's not clear whether asto binding is an ancestral trait of sarbeco's that's been lost, or is it a trait that was acquired more recently in a subset of asian sarbeco r b d? And so that's what they're trying to address in this paper. They do it in a very high put manner by they make a gen library of forty five sarbeco virus receptor binding domains,. spanning all foreign all four known clades of sarbaco viruses. Forty five different receptor binding domains.