In X-Men #5, it is revealed that in order for Wolverine to fully infiltrate the ranks of the vampires that were attacking Utopia at the behest of Dracula's son Xarus (when Wolverine thought the vampire virus had simply bested his healing factor) during the "Curse of the Mutants" storyline, Cyclops has to infect him with nanites that are capable of shutting off Wolverine's healing factor.
Dalam X-Men #5, terungkap bahwa agar Wolverine benar-benar menyusup ke jajaran vampir yang menyerang Utopia atas perintah putra Dracula (ketika Wolverine mengira virus vampir telah berhasil mengalahkan faktor penyembuhannya), Cyclops harus menginfeksi dia dengan nanites yang mampu mematikan faktor penyembuhan Wolverine.