
There's a back entrance with a Master terminal in the main room of Bioscience. When in the Institute, find the Institute FEV lab, an old locked area of Bioscience. From this point, the quest cannot be advanced until the player character makes their way to the Institute later in the game. In the conversation the Sole Survivor first has with Virgil, he requests that they retrieve a serum in exchange for his information about the Institute. Virgil's Cure automatically starts when talking to Brian Virgil in the main story quest The Glowing Sea.
