Friday, March 9, 2012

STPM Biology - Chapter 12: Immunity Q1

What does an antigen-presenting cell do? How do other cells recognize the antigen-presenting cell as a “friend”?


Answer:-
An antigen presenting cell engulfs foreign particles, digest them and present fragments of the antigen in its surface. The most common type are macrophages and activated B-cells. They are recognized by an antigen-MHC complex on their surface that allows them to have self markers along with the antigen fragments.

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