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日本科学家发现一种新方式，可将带有X及Y染色体的精子“分类”，选择性让小鼠产下希望的幼鼠性别。

研究人员认为，这项技术将能协助动物辅助生殖技术，有朝一日或能简化试管婴儿（IVF）的性别选择。

研究团队透过使用抗病毒药物resiquimod刺激两种受体，科学家成功让带有X染色体的精子减慢，带有Y染色体的精子加速，运用此种分离对小鼠进行体外授精实验，成功让小鼠产下83%雄性及81%雌性。

由于目前还没有已知的标记能区分带X、Y染色体的精子，研究团队使用的方式又非常简单便宜，也不会损害精子的DNA，生物学教授认为，这项研究很可能改变许多事。

但要在人类应用仍得面临许多问题，除了得确认resiquimod能否对人类精子造成相同影响，研究人员还得证明受精前刺激受体的举动，不会对出生的后代造成长期影响，除了这些，性别选择还涉及道德伦理问题。

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