A key step to the SARS-CoV-2 infection is the attachment of its Spike receptor-binding domain (S RBD) to the host receptor ACE2. Considerable research has been devoted to the development of neutralizing antibodies. including llama-derived single-chain nanobodies. to target the receptor-binding motif (RBM) and to block ACE2-RBD binding. https://parisnaturalfoodes.shop/product-category/org-vit-d3-spray-vanilla/