They went by their numbers only. Now, though, he gave them all names because his current serum didn’t really hurt them, it just gave them a fresh start and it wasn’t like a mouse would miss their memories, they were only mice after all.
Eric shaved away a bit of Neville’s hair and held him tight as the little mouse squirmed. Then Eric dipped the fingers of his double latex gloved hand into a small dish of white ointment and massaged it onto the bald spot. The mouse stayed still as he did so. Then Eric replaced the mouse in his cage and watched as the serum worked. It was hard to tell with a mouse how much had changed until he put it in the maze.