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A Bioweapon is a biological system, a form of life or a virus used for military purposes. This definition covers any such weapons used for any purpose, even the ones not directly harming and/or killing people such as agricultural pests or diseases intended to reduce the fighting power of the enemy's soldiers.

In "The Expanse", the term is especially used for both the unmodified protomolecule and subsequently for the "protomolecule soldiers" created by a secret research program.

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