وفر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.
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هي العملية التي تقوم بها الخلية باخراج مواد من داخل الخلية لتفرزها خارج الخلية عبر تشكيل حويصلات افرازية تتحد مع غشاء الخلية وتنفتح نحو وسط خارج الخلية ،تختلف تلك المواد باختلاف نوع الخلية وعملها.
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