When a female mosquito bites a person, she injects saliva containing foreign proteins into the skin to prevent the blood from clotting. This triggers a specific immune response in the person's body.

The list below shows five stages in this immune response:

• A: Helper T cells release chemical signals to activate B cells.
• B: Plasma cells produce and release specific antibodies that bind to the foreign proteins.
• C: White blood cells called macrophages engulf the foreign proteins.
• D: Macrophages present the foreign proteins on their surface to white blood cells called helper T cells.
• E: Activated B cells divide and differentiate into antibody-producing plasma cells.

Write these stages in the correct order in the boxes below. The first one has been done for you.

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