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- Hyperactivation is a type of sperm motility. Hyperactivated sperm motility is characterised by a high amplitude, asymmetrical beating pattern of the sperm tail (flagellum). This type of motility may aid in sperm penetration of the zona pellucida, which encloses the ovum. Hyperactivation could then be followed by the acrosome reaction where the cap-like structure on the head of the cell releases the enzymes it contains. This facilitates the penetration of the ovum and fertilisation. Some definitions consider sperm activation to consist of these two processes of hyperactivation and the acrosome reaction Hyperactivation is a term also used to express an X chromosome gene dosage compensation mechanism and is seen in Drosophila. Here, a complex of proteins bind to the X-linked genes to effectively double their genetic activity. This allows males (XY) to have equal genetic activity as females (XX), whose X's are not hyperactivated. (en)
- ハイパーアクチベーション（hyperactivation）は、精子の運動の型。 ハイパーアクチベーション化した精子の運動は精子尾部の不規則で激しいうねりを特徴とする。 ハイパーアクチベーションは卵母細胞を取り囲む透明帯への精子の侵入を補助する役割があると考えられている。 (ja)
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- ハイパーアクチベーション（hyperactivation）は、精子の運動の型。 ハイパーアクチベーション化した精子の運動は精子尾部の不規則で激しいうねりを特徴とする。 ハイパーアクチベーションは卵母細胞を取り囲む透明帯への精子の侵入を補助する役割があると考えられている。 (ja)
- Hyperactivation is a type of sperm motility. Hyperactivated sperm motility is characterised by a high amplitude, asymmetrical beating pattern of the sperm tail (flagellum). This type of motility may aid in sperm penetration of the zona pellucida, which encloses the ovum. Hyperactivation could then be followed by the acrosome reaction where the cap-like structure on the head of the cell releases the enzymes it contains. This facilitates the penetration of the ovum and fertilisation. (en)
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- Hyperactivation (en)
- ハイパーアクチベーション (ja)
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