人們可以透過語言或肢體動作表達自己所想或傳遞訊息,但身體細胞並沒有「嘴巴」,它們又如何互相溝通呢?553Please respect copyright.PENANAzfs1Kgfxke553Please respect copyright.PENANATNDrCRN54X
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(圖2)其中的一道方法,就是透過自身表面所呈現的物質作為橋樑。553Please respect copyright.PENANAXlAzwLJGq1
譬如說,當人體細胞表面的ACE2蛋白質或Neuropilin1蛋白質與武肺病毒表面的S蛋白質結合的話,武肺病毒便會入侵身體細胞裡頭。553Please respect copyright.PENANAGnM0q38fl2553Please respect copyright.PENANAfaDGcov0dy
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若細胞沒有ACE2/ Neuropilin1蛋白質的話,除非有額外的輔助,武肺病毒便沒法辨認得到細胞,順之然亦不會入侵對方。553Please respect copyright.PENANAnbNHhZSOqp
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(圖3)在大多數的情況下,細胞表面的物質均由蛋白質或脂肪所做成,糖份結構亦會鑲嵌在這些物質上,因而改變這些物質的形狀及用途。553Please respect copyright.PENANAs3GTFPMICL553Please respect copyright.PENANA8ZIOtlewni
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最近科學家們得出驚人的發現,一些不會參與蛋白質生產的RNA(non-coding RNA)亦會表達在細胞表面上,且有著糖份結構與自身連繫。553Please respect copyright.PENANAQXYKPkGVmQ
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這些結構在實驗室細胞及老鼠身上同時能找得到,可以說是大幅度改寫了學術界普遍對RNA功用的看法。553Please respect copyright.PENANA7W1n6HP6SV
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而這些表達在細胞表面的RNA究竟有甚麼用途,是否參與在免疫作用等用途,則還需日後一系列的研究。553Please respect copyright.PENANAVgw4SQLtxk
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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。553Please respect copyright.PENANAsKvx3Jd8q5
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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。553Please respect copyright.PENANA6SRHKf1nUW
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Ref1:https://www.cell.com/cell/fulltext/S0092-8674(21)00503-1
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