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  • Why Two Heads?

    Why Two Heads?

    Phenomenal Images

    Students explore images of planarians regenerating body parts as phenomena to explore cell division and differentiation.

  • Identifying the Key Genes for Regeneration

    Identifying the Key Genes for Regeneration

    Scientists at Work

    (9 min 55 sec) Planarians have an amazing ability to regenerate lost tissues. In this video, scientists knock out two different genes in planaria to start to understand how the process works—and they generate animals with two heads and two tails!

  • How We Get Our Skin Color Interactive

    How We Get Our Skin Color Interactive

    Interactive Videos

    (3 min 32 sec) This interactive animation about the biology of skin color provides stop points at which students can further explore the material through additional text and illustrations, videos, questions, and simple interactive widgets.

  • How We Get Our Skin Color

    How We Get Our Skin Color

    Animations

    (3 min 32 sec) This engaging animation shows how human skin cells produce the pigment melanin, which gives skin its color. 

  • Cancer and Cell Fate in the Intestinal Epithelium

    Cancer and Cell Fate in the Intestinal Epithelium

    Animations

    (2 min 17 sec) Disrupting the normal processes of differentiation and maturation of the intestinal epithelial cells can lead to cancer. Also available in Spanish.

  • Autism and the Structure and Function of Synapses

    Autism and the Structure and Function of Synapses

    Animations

    (2 min 3 sec) Genes associated with autism affect the structure and function of neuronal synapses.

  • Prialt blocks motor synapse in fish

    Prialt blocks motor synapse in fish

    Animations

    (2 min 31 sec) Prialt, a drug derived from cone snail venom, paralyzes fish by blocking calcium channels at a motor synapse.

  • Molecular Mechanism of Synaptic Function

    Molecular Mechanism of Synaptic Function

    Animations

    (1 min 9 sec) Electrical and chemical signals are used by neurons to communicate with one another at contact points called synapses. Also available in Spanish.

  • Signal molecules trigger transcription factors

    Signal molecules trigger transcription factors

    Animations

    (2 min 4 sec) Varying concentrations of a signaling molecule activate different transcription factors and determine cell fate.

  • CTL killing a target cell

    CTL killing a target cell

    Clips

    (1 min 17 sec) Video microscopy of a cytotoxic T lymphocyte in action.

  • Planarian Regeneration and Stem Cells

    Planarian Regeneration and Stem Cells

    Scientists at Work

    (11 min 47 sec) A mini-documentary discussing the remarkable regenerative capabilities of the planarian, and how HHMI researcher Alejandro Sánchez Alvarado uses them to study the biology of stem cells.

  • X Inactivation

    X Inactivation

    Animations

    (55 sec) This animation shows how the random deactivation of one of the X chromosomes in a pair can lead to a mozaicism in the expression genes. 

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