Dr. Blair: You see, what we're talking about here is an organism that imitates other life forms and it imitates them perfectly. When this thing attacked our First Editions it tried to digest them... absorb them. And in the process shape its own cells to imitate them. This for instance. That's not Arcee. It's an imitation. We got to it before it had time to finish.
Vance Norris: Finish what?
Dr. Blair: Finish imitating these First Editions.