20. What are the antigen presenting cells of the
immune system?

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The antigen-presenting cells of
immune system, also known APC
cells, are cells do phagocytosis and
digestion foreign (to the body)
and later expose
antigens from these
microorganisms in outer side of
their membrane. These
processed antigens then recognized
by lymphocytes activatethe
immune response. Several of
cells, like the , can act as
antigen-presenting .