This article delves into the spike protein and its furin cleavage site which some have argued looks engineered: https://nymag.com/intelligencer/article/coronavirus-lab-esca...

Incidentally (or perhaps not?), there is some evidence that the furin-cleavage site is what makes the virus resistant to hydroxychloroquine, which can be countered by combining it with a TMPRSS2 inhibitor: https://journals.plos.org/plospathogens/article?id=10.1371/j...