Fig. 2From: COVID-19 vaccine update: vaccine effectiveness, SARS-CoV-2 variants, boosters, adverse effects, and immune correlates of protectionViral variant and mutations. Amino acid alterations to the spike protein in SARS-CoV-2 VoCs. Domain composition of SARS-CoV-2 spike protein is shown in the bottom [118, 291]. Circles indicate point mutations or insertions; crosses indicate deletionsBack to article page