Antigen-Presenting-Cells process antigens and present them to T-cells. The internalized antigen is digested into smaller peptides, which are then presented to T cells by the MHC. The antigen, here a SAR-CoV-2 spike, can be 1. phagocytosed by the cell, or 2. the DNA encoding the spike can be brought into the cell where the spike protein is made then digested.
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