Epitеliy to’qimasi tuzilishi va xillari Birqavatli epiteliy kubsimon, prizmasimon, yassi va kiprikli epiteliy tuzilishi. Regeneratsiya

12.Periblastula 
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13. Morulaning hosil bo'lishi 
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14.To'liq va notekis maydalanishga misol sifatida rasm chizing.
14-Amaliy mashg'ulot 
Mavzu:Gastrulatsiya. Gastrulatsiya usullari va ularni 
organism taraqqiyoti darajasiga bog'liqligi.Mezoderma 
hosil bo'lish usullari 
1.Gastrulatsiya
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2.Invagi-natsion gastrulyatsiya 
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3.Immigrasiya
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