Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
a) Spike protein (composed of S1 and S2 subunits) of SARS-CoV-2. S1 contains the RBD. Using the RBD, the trimeric spike molecule binds to ACE2 on human cells. b) RBD residues, and c) Camelids have antibodies that are dimers of a single chain. The constant region is in black and the variable region in yellow. Reprinted from Ref. [34] with permission from Springer Nature. License Number: 5102850860955.
