Exotoxin
-- toxin
-- secreted by bacteria
-- can damage host     -- destroy cells     -- disrupt normal metabolism
-- highly potent
-- may also be released during death of the cell, like endotoxins
-- type 1 = signal at host cell membranes
-- type 2 = damage membranes
-- type 3 = enter cells and directly alter their function
-- lethal toxin     -- lethal factor     -- protective antigen
-- edema toxin     -- edema factor     -- protective antigen
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