Circular RNA lipid nanoparticle vaccine against SARS-CoV-2 - Kelsey L. Swingle; Alex G. Hamilton; Xuexiang Han; Kuo-Chieh Liao; Hannah C. Safford; Ajay S. Thatte; Hannah C. Geisler; Junchao Xu; Tzuen Yih Saw; Yue Wan; Michael J. Mitchell (Proceedings of the National Academy of Sciences, 2025)