Until his retirement he supplied all the botulinum toxin used in scientific and medical research in the nation.

退休之前，他向全国所有的科学和医学研究提供肉毒毒素。

The really dangerous part of the bacteria is the botulinum toxin they produce when they grow into mature bacteria.

这种细菌的真正可怕之处在于它们在成长为成熟细菌过程中产出的肉毒菌的毒素。