Tetrodotoxin. It is a powerful poison that is found in two almost totally unrelated kinds of animal: puffer fish and newts. It has been serving as a tool in nerve physiology and may provide a model for new local anesthetics.
D000777:Anesthetics; D000818:Animals; D005399:Fishes; D009431:Neural Conduction / Q000187:drug effects*; D013779:Tetrodotoxin; D014118:Toxins, Biological / Q000494:pharmacology*; D014562:Caudata
D000777:Anesthetics; D014118:Toxins, Biological; D013779:Tetrodotoxin