|“||subject injected 850ml THASARINE: to arrest regression||”|
—Dead Lycan’s body tag
The drug is seen as having been used in Underworld: Evolution, where Selene and Michael Corvin, having come to a Vampire Safe House to re-arm (and for Selene to leave Michael there to keep him safe), discover a dead Lycan test subject, still in its wolf form, despite having been dead for at least several weeks. Its body tag identified that the subject had been injected with 850ml to “arrest regression” for further study of its anatomy in its transformed body.
Its counterpart is the Anti-Change Enzyme developed by the Lycan scientist, Singe, an enzyme designed to stop and delay the transformation in persons who, while they have been bitten, have yet to transform into their wolf form themselves.