Documents from Lab X18, part 2

 is a storyline quest item that appears in S.T.A.L.K.E.R.: Lost Alpha.

"Experiment R-0925 yielded great results. Previous test, especially the ones using batch K-3, had the rats die before any profound observations could be made on a live subject - autopsy aside. K-4 batches has let rats take in the mutagen and evolve, surviving for well over a week before they died due to the “shrivelling effect” on a living being’s DNA. The results, although chaotic, has shown the many possibilities of genetic manipulation for medical and military application. At this rate, we might just move to human testing after a few more revisions to the K-X concoction."

- PDA description

Description

 * Referred to in the player's inventory as Mutagens on rats - Ivan S.