برون‌زهرابه

Also known as exotoxins

thumb|373x373px| This figure shows that exotoxins are secreted by bacterial cells, Clostridium botulinum for example, and are toxic to somatic cells. Somatic cells have antibody|antibodies on the cell wall to target exotoxins and bind to them, preventing the invasion of somatic cells. The binding of the exotoxin and antibody forms an antigen-antibody interaction and the exotoxins are targeted for destruction by the immune system. If this interaction does not happen, the exotoxins bind to the [[exotoxin receptors that are on the cell surface and causes death of the host cell by inhibiting prote