An<unk>  is a protein toxin released by a micro-organism in the lower intestine.<unk> s are frequently cytotoxic and kill cells by altering the permeability of the epithelial cells of the intestinal wall. They are mostly pore forming toxins, secreted by bacteria,  that assemble to form pores in cell membranes. This causes the cells to die.
The death of cells that form the barrier between the intestinal lumen and the surrounding tissue causes interstitial fluid, composed of water and electrolytes to leak into the intestinal tract, causing diarrhea.
Enterotoxin
Chlorotoxin
Neurotoxin
Pneumolysin
Ochratoxin A
Fibrinolysin
Heteropodatoxin
Muconic acid