S6P mutation in Delta and Omicron variant spike protein significantly enhances the efficacy of mRNA COVID-19 vaccines. - Bong YS; Brown D; Chung E; Ananthaswamy N; Chen R; Lewoczko E; Sabbers W; Patterson-Orazem AC; Dorsey Z; Zou Y; Yu X; Liang J; et al. (Frontiers in immunology, 2025)