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Background
SARS‐CoV‐2 has spread worldwide causing more than 400 million people with virus infections since early 2020. Currently, the existing vaccines targeting the spike glycoprotein (S protein) of SARS‐CoV‐2 are facing great challenge from the infection of SARS‐CoV‐2 virus and its multiple S protein variants. Thus, we need to develop a new generation of vaccines to prevent infection of the SARS‐CoV‐2...