Paralytic Shellfish Poisoning NH2 A possible che mical warfare agent roughly 1000 times more toxic -NH than saran gas or cyanide HN N-H -OH The toxin blocks entry ofsodium OH required by cells to make "action potentials" Saxitoxin (STX) LD50=2μg/kg Paralytic Shellfish Poisoning N N N N OH OH H HN H O O NH2 NH H Saxitoxin (STX) LD50 = 2 g/kg A possible chemical warfare agent roughly 1000 times more toxic than saran gas or cyanide The toxin blocks entry of sodium required by cells to make "action potentials