A few vaccines have no antigens in them. Instead, the vaccines contain a molecule of mRNA. Cells in the immune system use the mRNA molecule to synthesise a protein antigen. What is the correct sequence of the stages by which mRNA vaccines function?
- A1 → 2 → 4 → 3
- B3 → 1 → 2 → 4
- C3 → 4 → 1 → 2
- D4 → 1 → 2 → 3