antigen, protein on the surface of a pathogen, pathogen, microorganism that causes harm to a person, antibody, protein made by a white blood cell, white blood cell, a cell responsible for an immune response, immune response, a process which happens to fight off invaders, specific, one type only, engulfing, white blood cells do this to pathogens "marked" by anitbodies, memory cells, a way the body remembers how to recognise pathogens, Virus, a non living pathogen, bacteria, a unicellular living pathogen,

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