Immunity

Recognising own cells

• Each type of cell has specific molecules on it's surface to identify it. These help the immune system to identify -
• 1. Pathogens
• 2. Non-self material such as cells from another organism
• 3. Toxins
• 4. Abnormal body cells e.g cancerous cells
• Antigen: A protein on a cell's surface that can produce an immune response, and is non-self.

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