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  • Red Tattoo

    Red Tattoo

    Image of the Week

    A section of stained human skin bearing a red tattoo.

  • Tugging The Cellular Heartstrings

    Tugging The Cellular Heartstrings

    Image of the Week

    The microtubules inside cardiomyocytes buckle when the heart contracts.

  • Colorizing Skin Cells

    Colorizing Skin Cells

    Image of the Week

    The “skinbow” zebrafish has color-coded skin cells when viewed in a microscope using UV light illumination.

  • Crystals and the Color of Skin

    Crystals and the Color of Skin

    Image of the Week

    The panther chameleon alters the arrangement of tiny crystals in its skin to change color.

  • How We Get Our Skin Color Interactive

    How We Get Our Skin Color Interactive

    Interactive Video

    (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

    Animation

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

  • Dottyback in Damselfish Clothing

    Dottyback in Damselfish Clothing

    Image of the Week

    Dottyback fish change color by altering the proportions of yellow and black pigment cells in their skin to mimic Damselfish.

  • Biodiversity at a Snail's Pace

    Biodiversity at a Snail's Pace

    Lecture

    (58 min 29 sec) Cone snails have evolved many different toxins for different uses. Total molecular biodiversity may number in the millions.

  • Exploring Biodiversity: The Search for New Medicines

    Exploring Biodiversity: The Search for New Medicines

    Lecture

    What medical secrets do venomous snails hold? How can listening in on bacterial conversations help develop new antibiotics? In four presentations, Dr. Bonnie L. Bassler and Dr. Baldomero M. Olivera reveal how a deeper understanding of nature and biodiversity informs their research into new medicines.

  • Prialt blocks motor synapse in fish

    Prialt blocks motor synapse in fish

    Animation

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

  • Prialt blocks pain signaling in mice

    Prialt blocks pain signaling in mice

    Animation

    (2 min 58 sec) Prialt does not block the mammalian motor synapse, but blocks the pain pathway in the spinal cord.

  • Plan of Action: How the Spinal Cord Controls Movement

    Plan of Action: How the Spinal Cord Controls Movement

    Lecture

    (58 min 29 sec) Understanding the neural circuits in the spinal cord that control movement.

  • Demo: Electrical measurement of muscle activity

    Demo: Electrical measurement of muscle activity

    Clip

    (2 min 10 sec) A live recording of muscle activity from Dr. Jessell's biceps and triceps muscles.

  • Repellant ephrin signals guide limb innervations

    Repellant ephrin signals guide limb innervations

    Animation

    (1 min 34 sec) The growth cone of a neuron avoids repellant molecules and navigates to innervate the appropriate muscle.

  • Tissue Regeneration in Animals

    Tissue Regeneration in Animals

    Click & Learn

    An overview and comparison of different regenerative capabilities in many different organisms.

  • Stem Cells and the End of Aging

    Stem Cells and the End of Aging

    Lecture

    (58 min 25 sec) Finding factors to reverse age-related loss of cell maintenance, and some examples of stem cell therapies.

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