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• 17:41, 15 January 2023 Nikolas talk contribs created page 3. Recognition molecules, MHC molecules (Created page with "While B-cells can bind free antigens in the blood and tissues, T-cell receptors can only bind to antigens that are being presented to them by other cells. This means that a T-cell cannot recognize a bacterium or virus floating past; some other cell has to digest the bacterium or virus and then ''present'' a small part of it, an antigen, from the pathogen to the T-cell for it to be activated. == Major histocompatibility complex == A protein called major histocompatibilit...") Tag: Visual edit