以下为句子列表：
英文: Studies in human fetuses note opioid (enkephalin-like) immunoreactie fibers as early as 10 weeks; moreoer, mu and kappa receptors predominate at birth, with low densities of delta receptors.
中文: 人类胎儿研究表明，阿片剂（类-脑腓肽）免疫反应纤维在10周左右即存在；而且，μ和κ受体在出生时占主导地位，δ受体则较少。
更详细...
英文: Studies in human fetuses note opioid (enkephalin-like) immunoreactive fibers as early as 10 weeks; moreover, mu and kappa receptors predominate at birth, with low densities of delta receptors.
中文: 人类胎儿研究表明，阿片剂（类-脑腓肽）免疫反应纤维在10周左右即存在；而且，μ和κ受体在出生时占主导地位，δ受体则较少。
更详细...
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