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The experimental serum is a quest item in Fallout 4.

Characteristics

As its name suggests, it is an experimental serum created by Virgil during his time at the Institute, in order to counter the effects of the Forced Evolutionary Virus on a subject.

Location

Located inside the FEV lab, in the BioScience division inside the Institute. It can be found inside a device on a desk under the board of lights, in the back of the room with the two super mutants suspended in vats.

Related quest

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