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S evresi.
S evresi: G1 evresinin bitişini izler. Normal hücrelerde 6 saat kadar sürer. Bu evrede hücrenin DNA miktarı iki katına çıkarak (duplikasyon), her kromozomun eksiksiz bir eşinin yapılması sağlanır. Kromozomlar iki kromatitli hale geçer. Örneğin 2n: 16 olan bir hücrede 16x2=32 kromatit oluşur. "S" evresi geçirmeyen bir hücre bölünmez; S evresi geçiren bir hücre ise eninde sonunda bölünür. Hayvan ve insan hücrelerinde en erken olan olaylardan biri sentrozomların eşlenmesidir. Sentrozomlar iğ ipliklerini oluşturan hücre organelleridir.
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Siklin | A (A1, A2) · B (B1, B2, B3) · D (D1, D2, D3) · E (E1, E2) |
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CDK | 2 · 3 · 4 · 5 · 6 · 7 · 8 · 9 · 10 · CDK-aktive kinaz |
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CDK inhibitör | |
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P53 p63 p73 ailesi | |
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Diğerleri | Cdc2 · Cdc25 · Cdc42 · Cellular apoptosis susceptibility protein · E2F · Maturation promoting factor · Wee · Cullin (CUL7) |
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Fazlar ve
kontrol noktaları | İnterfaz | |
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M evresi | |
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Hücre döngüsü kontrol noktaları | Kısıtlama noktası · Spindle noktası · Kopyalama noktası |
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Diğer hücresel evreler | |
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