Antigen processing I Antigen processing I A protein molecule (on the left) is digested by the cell and a fragment from it (shown in green) is loaded into.

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Antigen processing I Antigen processing I A protein molecule (on the left) is digested by the cell and a fragment from it (shown in green) is loaded into an MHC molecule that is then displayed on the surface of the cell (on the right), oriented so that it can be scanned by T-cells. The MHC molecule is ∼7 nm tall above the cell membrane. Not to scale. Jawahar Swaminathan and MSD staff at the European Bioinformatics Institute https://commons.wikimedia.org/w/index.php?curid=6292018 Lindsay B. Nicholson Essays Biochem. 2016;60:275-301 ©2016 by Portland Press Ltd