A Bacterium Using a Type 3 Secretion System to Secrete Invasins in order
to Enter a Host Cell

Some bacteria use a type 3 secretion system system to secrete invasins into a host cell in order to activate the host cell's cytoskeletal machinery and enabling bacterial entry into the cell by phagocytosis. By entering the cytoplasm of the host cell, it has a ready supply of nutrients and is able to protect the bacteria from complement, antibodies, and certain other body defenses.

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