"Why did it take me and my dad to publish about serial passage? It’s the glaringly most obvious source for a virus with an indeterminate origin like this, since by de nition it blurs the line between natural and arti cial," since it’s a natural process arti cially accelerated and<br><br>channeled. " <br>Dan Sirotkin<br><br>Might SARS-CoV-2 Have Arisen via Serial Passage through an Animal Host or Cell Culture?: A potential explanation for much of the novel coronavirus' distinctive genome<br><a href=""https://pubmed.ncbi.nlm.nih.gov/32786014/"">https://pubmed.ncbi.nlm.nih.gov/32786014/</a>"