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A protein found inside your cells, especially in muscle cells. Long threads of actin, working together with another protein called myosin, are what let your muscles tighten and let cells move or change shape. It's a word from biology, not something people use in everyday talk.
肌動蛋白(存在於細胞內，與肌肉收縮有關的一種蛋白質)
組成act (to do, to move) + -in (a common ending for naming proteins, seen also in words like insulin).
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
actinnoun/ˈæktɪn/
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biochemistrybiologychemistryA globular structural protein that polymerizes in a helical fashion to form an actin filament (or microfilament).
- 2012, Elaine N. Marieb & Katja Hoehn, Human Anatomy & Physiology, 8th ed., chapter 9 "Muscles and Muscle Tissue", page 281. Actin has kidney-shaped polypeptide subunits, called globular actin or G actin, which bear the active sites to which the myosin heads attach during contraction.
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biochemistrybiologychemistryOne of the six isoforms of actin.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。