Nanites, Generator Rex Wiki

Nanites are the microscopic machines courtesy of Ray Palmer during the Nanite Event, and spread across the globe at the time of the explosion. Nanites exist within every living being, bonded to their molecular structure. Normally, nanites are completely harmless. Though, when activated, they mutate the biology of their host giving them grotesque physical features and special abilities, these are called E.V.O.s. As previously mentioned activated nanites change the hapless individual into an often

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For those who say upgrade is something other than Nanites : r/Ben10

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