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Defense against disease - planning 6.3

Planning sheet for defense against diseaseUnderstanding(s):Blood clotting and heart diseaseImmune System Antigens and antibodies HIV and AIDSEssential Question(s) How can the proteins on the surface of cells, called antigens, help the body"s immune system to identify pathogens?How does blood clot?What have blood clots got to do with heart attacks?

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