The Embryonic Yolk Sac, the Liver, and the Bone Marrow

question 53

Multiple Choice

The embryonic yolk sac, the liver, and the bone marrow are sites where _______.

• A) antigen is filtered from tissue fluid
• B) antigen is filtered from the blood
• C) T lymphocytes complete maturation
• D) stem cells give rise to immature lymphocytes
• E) immune responses to antigen occur

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