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WikiPedia: Kỳ_giữa http://www.nature.com/scitable/definition/metaphas... http://users.rcn.com/jkimball.ma.ultranet/BiologyP... http://www.biology-online.org/dictionary/Metaphase... https://www.sciencedaily.com/releases/2007/06/0706... https://web.archive.org/web/20121119134405/http://...