مصادر الكيمياء موقع لتعليم الكيمياء بصورة مبسطة
actin a major protein constituent of the thin filaments of muscle and of the microfilaments found in practically all eukaryotic cells – it comprises 5–10% of the protein of such cells (see actin filament). In solutions of low ionic strength, actin is a globular 42 kDa monomer, termed G-actin. At physiological ionic strengths, G-actin polymerizes into a fibrous form, termed …
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