腸道是我們身體其中一道消化器官,其內壁表面含有名為絨毛(villi)的結構,輔助營養的吸收;493Please respect copyright.PENANAivZlLLFnTw
而絨毛與絨毛之間,則有名為crypt的凹陷結構。493Please respect copyright.PENANAkQasLkdOfx493Please respect copyright.PENANAQuyzMS2K4v
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(圖2)凹陷的crypt結構大多由幹細胞構成,它們會自我複製及演化,且不斷向上發展到達villi結構,形成可負責幫忙吸取營養的細胞。493Please respect copyright.PENANANltMCqxZ70493Please respect copyright.PENANA9wDa61lhl7
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(圖3)若位於crypt的幹細胞出現相應的基因突變(KrasG12D /PIK3CAH1047R ),它們會釋放出界別為BMP activator及WNT inactivator的物質,而當鄰近的正常細胞吸取這些物質後,出現基因突變的機率亦會提升。493Please respect copyright.PENANA1o5FxCeg7U493Please respect copyright.PENANArWU0AWFuCG
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換句話說,只要一顆位於crypt的幹細胞出現突變的話,便會出現火燒連環船一樣的效果,一傳十十傳百的透導各鄰近的細胞出現異變,成為癌細胞的一份子。493Please respect copyright.PENANAvpSFA3Emd3
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如果想我快啲出文的話,請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark,這對我非常之重要。493Please respect copyright.PENANAgZvS3cD28t
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Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc493Please respect copyright.PENANAOIzuY1xauJ
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同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」,以課金的方式推動我繼續搜羅資料寫文,多謝。493Please respect copyright.PENANAIO7VxR3Wak
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Link:493Please respect copyright.PENANAH3jQfsbcnT
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio493Please respect copyright.PENANAm32icHWAhj
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除非Facebook及IG重開侵侵的account,否則我的IG將不會再作更新,只會寄居本土LIHKG及Penana。493Please respect copyright.PENANAuCHZaQpw7m
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Ref1:https://www.nature.com/articles/s41586-021-03605-0
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