Dr. Sean Grier was a researcher at Gentek who was involved in the development of Bloodtox. Alex Mercer retained a memory of Grier explaining about the Bloodtox to Dr. Raymond McMullen.
- Sean Grier: "Substance A-113A -- which we call Bloodtox, due to its odd coloration -- is a poison which only affects the Blacklight virus."
- McMullen: "Side effects?"
- Sean Grier: "It shouldn't affect humans at all."
- —Grier, explaining about the Bloodtox
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