<unk>  differs from birtoxin by only a single residue, but has a markedly reduced biological activity. In mice experiments, intracerebroventricular administration of<unk>  induced unprovoked jumps. These jumps were observed at a concentration that was 1000-fold higher than in the case of birtoxin, and their onset was much slower. Another difference between these toxins is that birtoxin produced convulsions, tremors, increased ventilation and, subsequently, death. Injection of up to 4 μg of<unk>  in mice was not lethal.<unk>  seems to affect only mammals.
Ikitoxin
Saxitoxin
Agitoxin
Kaliotoxin
Bungarotoxin
Dortoxin
Presepsin
Charybdotoxin