3.2.4 - cell recognition and the immune system
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4 Terms
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Each type of cell has specific molecules on its surface that identify it.
2
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These molecules include proteins and enable the immune system to identify:
• pathogens • cells from other organisms of the same species • abnormal body cells • toxins.
3
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Definition of antigen.
4
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The effect of antigen variability on disease and disease prevention
Note 
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