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Dan Barouch, a Harvard Medical School vaccine scientist working with J&J on its COVID-19 vaccine, tested six versions of the vaccine in 35 monkeys. The spike protein vaccine with the 2P mutation. Spikevax is a mRNA vaccine. It contains a piece of the SARS-CoV-2 virus's genetic material that instructs cells in the body to make the virus's distinctive "spike" protein. After a person.