Mechanism of Action of mRNA Based Vaccine 1. mRNA encapsulated in the delivery vehicle is taken up by APC cell. 2. Delivery vehicle is digested, and mRNA released. 3. mRNA is translated by the host’s ribosome and antigen is formed. 4. After the antigen is formed, it can be processed through different pathways. https://www.creative-biolabs.com/vaccine/mrna-vaccine-platform.htm