細胞核(粵拼:sai3 baau1 hat6,拉丁文:Nucleus)係細胞裏頭嘅封閉式胞器,內部含遺傳物質,亦即係DNA。細胞核嘅作用,用嚟二維持基因嘅完整性,藉住由調節基因表現嚟到影響細胞活動。
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