Once a macrophage ingests a foreign antigen, how is the antigen presented?
a. The antigen is embedded directly into the cell membrane of the macrophage.
b. The antigen is embedded in the membrane of a transport vesicle and released via exocytosis.
c. The antigen is attached to a receptor protein, forming a receptor-antigen complex.
d. The antigen is attached to MHC markers, forming a MHC-antigen complex
e. The antigen becomes part of the T cell membrane.
ANSWER: d
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