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  • Top Notch Model Organism

    Top Notch Model Organism

    Image of the Week

    Close-up of cells in a fruit fly eye at the pupal stage stained with antibodies to the Notch protein.

  • Perfect Daughters

    Perfect Daughters

    Image of the Week

    Chromosomes change form as a cell divides to ensure that each daughter cell gets a full, intact copy of the genome.

  • Understanding Embryonic Stem Cells

    Understanding Embryonic Stem Cells


    (58 min 27 sec) An overview of embryonic development, the progressive differentiation of cells, and properties of embryonic stem cells.