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  • 21:14, 13 December 2022 Nikolas talk contribs created page 22. A-B-0 blood groups. The Rh blood types (Created page with "== Cell antigens == All cells have many proteins on the outside of their cell membranes. We say that the cells ''express'' these proteins. Different cells express different proteins, which allows them to interact with other cells and the environment differently. All proteins are also ''antigens''. An antigen is a molecule which the immune system can recognize. When a person is infected with a bacterium for example, the immune cells will recognize the antigens (proteins)...") Tag: Visual edit