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biological

Judged: two independent readers; copy check clear.

TTX

TTX TTX, or tetrodotoxin, is a neurotoxin that blocks fast voltage-gated sodium channels in nerve cell membranes, preventing nerve signals from being transmitted.

TTX, or tetrodotoxin, is a neurotoxin that blocks fast voltage-gated sodium channels in nerve cell membranes, preventing nerve signals from being transmitted. It has potential pain-relieving activity and is produced by certain bacteria, although it is also found in animals such as pufferfish.