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Quelles sont les 2 propositions exactes ?A. Dans les cellules animales, le fuseau mitotique s'organise autour de structures appelées centrosomes, petites structures formées de deux centrioles et de matériel péricentriolaire. B. Le fuseau mitotique est formé de trois types de microtubules, les microtubules kinétochoriens, responsables des mouvements des chromosomes, les microtubules astraux, responsables de la polarisation de la cellule et les microtubules polaires, responsables de l'ancrage des centrosomes à la membrane cytoplasmique. C. L'activation du MPF (Maturation/Mitosis Promoting Factor) conduit, entre autre, à la phosphorylation des lamines ce qui conduit à la rupture de l'enveloppe nucléaire.D. Le passage à l'anaphase est dû à la protéolyse brutale de la cycline E qui conduit à l'inactivation du MPF. E. Autre réponse.

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