Structure

https://science.sciencemag.org/content/367/6483/1260.full

https://www.sciencedirect.com/science/article/pii/S0092867420302622

https://www.cell.com/cell/pdf/S0092-8674(20)30338-X.pdf

https://www.nature.com/articles/s41586-020-2179-y_reference.pdf