9. BOTTOMLINE: 1) Seafood market not the source. 2) This RNA #coronavirus mutates really fast. 3) 🧬 has unusual middle segment never seen before in any coronavirus. 4) Not from recent mixing. 5) That mystery middle segment encodes protein responsible for entry into host cells.

— Dr. Eric Feigl-Ding (@DrEricDing) January 28, 2020