cell recognition

• How do cells recognise foreign cells?

  Specific molecules found on the surface of cells that enable them to be identified by the body.
• What are these molecules?

  proteins
• What are the proteins usually part of?

  The phospholipid bilayer, such as glycoproteins or glycolipids.
• What do the surface proteins enable the body to recognise as 'non-self'?

  Pathogenic cells

  Abnormal cells (cancerous or pathogen-infected)

  Toxins

  Cells from other individuals from the same species, e.g. organ transplants.
• What needs to be done in order for organ transplants to be successful?

  Immunosuppressant drugs
• What are the surface molecules used to identify cells known as?

  Antigens