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表觀遺傳學
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我們的身體並非只是體內基因的總和,一個人吸收的營養、創傷經歷、疾病和生活方式等環境因素,都會影響個別基因的開關狀態。科學家將最新的研究發現比喻為一部鋼琴,弦線和琴鍵代表基因;唯有琴鍵被敲擊時,生命的旋律才會響起。長久以來,生物學的教條都告訴我們,生物的特徵乃取決於遺傳基因物質,不容改變,但表觀遺傳學的新發現卻將這套學說完全推翻。