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  • word of the day

    vitelline sac

    vitelline sac - 365bet中国官方网站 definition and meaning for word vitelline sac

    Definition
    (noun) membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional

  • Word used in video below:
    text: a small sac of fluid located in the center of the human brain.
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