FFY-containing nanobodies demonstrated increased potencyin neutralizing SARS-CoV-2 (Figure 14b,j).338 Additionally, o-sulfonyl fluoride-O-methyltyrosine (SFY),developed to enlarge the reaction area, can cross-link with carbohydratesand enhance cancer cell killing by NK cells through irreversible cloakingof sialoglycan (Figure 14b,e).339 Liu et al. developed fluorosulfonyloxybenzoyl-l-lysine (FSK) to produce covalent nanobodies that irreversiblybound to epidermal growth factor receptors (EGFR) on cells.340. The gene discussed is EGFR; the disease is cancer.