Instead the third molar tooth buds that provided cells to seed the scaffolds might have contained hidden stem cells ? potent progenitors of other cell types ? that were responsible for forming the new tissue 也許,提供細胞接種在支架上的第三臼齒牙胚,可能含有看不見而負責形成新組織的干細胞(可以生成其他種類細胞的前驅細胞) 。