Thanks John, One other note, apparently the toxin is used to produce an effect on one of the 4 "petals" on the VGSD which causes the pore in the center to shut which stops the channel from allowing the entry of sodium, the catalyst for the pain response. Also, I forgot to mention that there are other creatures beside pufferfish from which this TTX toxin can be extracted such as

Gastropod mollusc.
The eggs of horseshoe crabs.
Newts of the genus Taricha.
The skin of Atelopid frogs.
The skin and viscera of porcupine fish, globefish, balloon fish, blowfish, sunfish, toadfish, blue-ringed octopus, and some species of salamanders.

I think I also read tarantula (or perhaps black widow) spiders, can't remember which.

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