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4. Which immune cells circulate in the body, providing immunity by producing antibodies?

User Desval
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Answer:

Immune System

Step-by-step explanation:

User Dumindu Perera
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Antibodies are produced by white blood cells called B cells ( B lymphocytes ) and they develop from stem cells in the bone marrow. B cells are activated when an antigen is present.

User Svek
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