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    • Biological Unit for Vitamin A - Nature

      Nature· 16 hours ago

      VITAMIN A is unique in that the unit by which it has been defined has been measured with reference to a precursor, β-carotene, and not to vitamin A itself. This biological ...

    • Societies and Academies - Nature

      Nature· 16 hours ago

      In a narrow tube, placed horizontally in the dark, the aggregation takes the form of a series of groups which look like green...central region moving downwards under the influence of gravity ...