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  • Root Movement

    Root Movement

    Image of the Week

    Root tips constantly search the soil for water and nutrients using the power of cell division and elongation.

  • Biological Basis of a Myth

    Biological Basis of a Myth

    Image of the Week

    Hydra is a small freshwater hydrozoan polyp that has the capacity to grow a new individual from any part of its body.

  • Trojan Micro Horses

    Trojan Micro Horses

    Image of the Week

    Spheres made from sugar polymers hide insulin-producing cells from attack by the immune system.

  • Fish Tales

    Fish Tales

    Image of the Week

    Zebrafish blood is generated from stem cells located in the tail region of fish embryos and later from stem cells located in the kidney of the adult fish.

  • Potent Stem Cells

    Potent Stem Cells

    Poster

    The poster from the 2006 Holiday Lectures on Science, Potent Biology: Stem Cells, Cloning, and Regeneration, illustrates the role of stem cells during human embryonic development.

  • The Making of a Fly's Brain

    The Making of a Fly's Brain

    Image of the Week

    The developing brain needs a constant source of new cells as it builds the circuits that will control behavior.

  • Classroom Activities: Planaria Regeneration Activity

    Classroom Activities: Planaria Regeneration Activity

    Activity

    This activity uses the planaria's property for regeneration and compares how long it takes for planaria cut in different places to regenerate a head. 

  • Classroom Activities: Stem Cells and Diabetes

    Classroom Activities: Stem Cells and Diabetes

    Activity

    To accompany the lecture series Potent Biology: Stem Cells, Cloning, and Regeneration.

  • Stem-Cell-Based Therapies

    Stem-Cell-Based Therapies

    Click & Learn

    An exploration of current and future therapies.

  • Tissue Regeneration in Animals

    Tissue Regeneration in Animals

    Click & Learn

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

  • Stem Cell Research: Policies and Ethics

    Stem Cell Research: Policies and Ethics

    Lecture

    (46 min 11 sec) A discussion on policies and ethical issues associated with stem cell research.

  • 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.

  • Coaxing Embryonic Stem Cells

    Coaxing Embryonic Stem Cells

    Lecture

    (58 min 25 sec) In cloning, a cell's genetic machinery is reprogrammed. Can we similarly coax stem cells to become specific cell types?

  • Adult Stem Cells and Regeneration

    Adult Stem Cells and Regeneration

    Lecture

    (58 min 25 sec) The role of stem cells in regeneration, and ongoing research to improve mammalian regeneration potency.

  • Understanding Embryonic Stem Cells

    Understanding Embryonic Stem Cells

    Lecture

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

  • Potent Biology: Stem Cells, Cloning, and Regeneration

    Potent Biology: Stem Cells, Cloning, and Regeneration

    Lecture

    Doug Melton and Nadia Rosenthal are leaders in stem cell research, working primarily with mouse and human tissue. They will discuss where embryonic and adult stem cells come from and the biology of how they supply the cells the body needs.

  • Somatic Cell Nuclear Transfer Video

    Somatic Cell Nuclear Transfer Video

    Clip

    (2 min) Somatic cell nuclear transfer (SCNT) is performed looking through a microscope and using small glass pipettes to handle human eggs and to remove and transfer nuclei from one cell to another.

  • 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.

  • Cultured Human Embryonic Stem Cells

    Cultured Human Embryonic Stem Cells

    Clip

    (1 min 18 sec) Cell cultures derived from human embryonic stem cells can reproduce indefinitely and also differentiate into specialized cell types, including beating heart cells.

  • Antlers and Mammalian Regeneration

    Antlers and Mammalian Regeneration

    Clip

    (2 min 19 sec) Dr. Rosenthal describes how antlers are one of the few examples of complete mammalian regeneration.

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