The rapid spread and dominance of the Omicron SARS-CoV-2 lineages have posed severe health challenges worldwide. While extensive research on the role of the Receptor Binding Domain (RBD) in promoting viral infectivity and vaccine sensitivity has been well documented. the functional significance of the 681PRRAR/SV687 polybasic motif of the viral spike is less clear. In this work. https://herbsdailyes.shop/product-category/phyllanthus-chanca-piedra/