A novel severe acute respiratory syndrome (SARS)like coronavirus (SARSCoV2) recently emerged and is rapidly spreading in humans, causing COVID19 1,2 A key to tackling this pandemic is to understand the receptor recognition mechanism of theSearch the world's information, including webpages, images, videos and more Google has many special features to help you find exactly what you're looking forStack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers Visit Stack Exchange Pdf Bilevel Optimization Advances And Next Challenges _E"xXg R[f "Y 2020