Eric.So

It was discovered in SARS-CoV-2's unique furin cleavage site, the part that makes it so good at infecting people and separates it from other coronaviruses.
The structure has been one of the focal points of debate about the virus's origin, with some scientists claiming it could not have been acquired naturally.  
The international team of researchers suggest the virus may have mutated to have a furin cleavage site during experiments on human cells in a lab.
They claim there is a one-in-three-trillion chance Moderna's sequence randomly appeared through natural evolution.
But there is some debate about whether the match is as rare as the study claims, with other experts describing it as a 'quirky' coincidence rather than a 'smoking gun'.


https://www.dailymail.co.uk/news/article-10542309/Fresh-lab-leak-fears-study-finds-genetic-code-Covids-spike-protein-linked-Moderna-patent.html