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Hon har inte ett fullt skelett, bara hennes klor
Från Wikipedia
Unlike Wolverine, however, X-23 has only two claws per hand which are her primary weapons of offence. She also possesses a single, retractable claw housed within each foot which she tends to use for defense. These claws are actually made of bone and were forcefully extracted by Zander Rice, sharpened, coated with adamantium, and reinserted into her body. Also unlike Wolverine, X-23 escaped before the procedure to fuse her entire skeleton with adamantium could be performed.