Tetrodotoxin-producing Bacillus sp. from the ribbon worm (Nemertea) Cephalothrix simula (Iwata, 1952)

Microdistribution of tetrodotoxin in Bacillus sp 1839. Transmission electron micrographs showed that some bacteria with mature forespore were TTX-gold labeled. Cytoplasm of mother cell was slightly labeled. Coat and cortex of the forespore were heavy labeled, whereas forespore core was moderately labeled.