▁them ▁extend ▁out ward . ▁ ▁In ▁instances ▁of ▁extreme ▁dur ess , ▁His ako ▁is ▁also ▁able ▁to ▁expand ▁her ▁arm or , ▁greatly ▁strength ening ▁and ▁increasing ▁its ▁size ▁and ▁shape ▁around ▁her , ▁though ▁her ▁own ▁body ▁remains ▁the ▁same ▁at ▁its ▁center . ▁ ▁His ako ' s ▁body ▁arm or ▁is ▁partially ▁explained ▁as ▁being ▁composed ▁of ▁something ▁related ▁to ▁her ▁family ▁line age ▁and ▁ancest ors . ▁It ▁is ▁later ▁described ▁as ▁being ▁composed ▁of ▁memory . ▁ ▁This ▁is ▁stated ▁in ▁an ▁issue ▁of ▁Wol ver ine : ▁Orig ins , ▁when ▁His ako ' s ▁arm or ▁is ▁able ▁to ▁with stand ▁blow s ▁from ▁the ▁Mur am asa ▁bla de , ▁which ▁can ▁cut ▁through ▁any ▁material , ▁since ▁memory ▁is ▁" the ▁only ▁material ▁that ▁the ▁bla de ▁cannot ▁cut ▁through ." ▁Similarly , ▁in ▁A ston ishing ▁X - Men , ▁vol . ▁ 3 ▁# 3 9 , ▁Arm or ' s ▁arm or ▁exp ands ▁and ▁grows ▁to ▁the ▁size ▁of ▁a ▁building ▁due ▁to ▁the ▁fact ▁she ▁feels ▁strongly ▁about ▁not ▁att ending ▁her ▁recently ▁dece ased ▁mother ▁and ▁brother ' s ▁w ake . ▁ ▁His ako ▁has ▁also ▁received ▁combat ▁training ▁from ▁Wol ver ine ▁and ▁classes ▁in ▁tact ics ▁from ▁Cy clo ps . ▁ ▁Other ▁versions ▁ ▁Le ader ▁of ▁the ▁X - Men ▁In ▁Run aw ays , ▁a ▁time - dis pla ced ▁future ▁version ▁of ▁Ger tr ude ▁York es ▁mentioned ▁a