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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.

  • Single Mother

    Single Mother

    Image of the Week

    A queen bee may produce as many as 60,000 offspring during her lifetime.

  • Larval Biscuit

    Larval Biscuit

    Image of the Week

    A pluteus larva of the sea biscuit, Clypeaster subdepressus, an echinoderm closely related to sea urchins.

  • Seeing In the New Year

    Seeing In the New Year

    Image of the Week

    Multi-color labeling of photoreceptor neurons in the developing visual system of the fruit fly (Drosophila melanogaster).

  • Genetic Mutations and Disease Interactive

    Genetic Mutations and Disease Interactive

    Click & Learn

    This interactive focuses on the roles of germline and somatic cell mutations in human disease. It supports the 2013 Holiday Lectures on Science, Medicine in the Genomic Era.

  • 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.

  • Zebrafish Brain Cells for Spontaneous Navigation

    Zebrafish Brain Cells for Spontaneous Navigation

    Image of the Week

    The brain and part of the spinal cord of a one-week-old zebrafish, showing neurons that are active during a left turn (green), a right turn (red), or when swimming straight ahead (blue)

  • 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.

  • Unconditional Love

    Unconditional Love

    Image of the Week

    A mother and her baby viewed using magnetic resonance imaging (MRI).

  • The Heart of the Matter

    The Heart of the Matter

    Image of the Week

    Early theories of the heart’s role were largely based on its central position in the body.

  • Reckless Growth

    Reckless Growth

    Image of the Week

    The organization of cells in a healthy mouse intestine is lost in a growing tumor.

  • Synchronized Division

    Synchronized Division

    Image of the Week

    The early embryonic cells of the sand dollar are caught in the act of synchronized cell division.

  • Making the Flow

    Making the Flow

    Image of the Week

    The surface cells of tadpole embryos have cilia that move the water around them.

  • The Embryo Puzzle

    The Embryo Puzzle

    Image of the Week

    A new technique tracks thousands of cells in the fruit fly (Drosophila) embryo during development.

  • Have Your Larva and Eat It Too

    Have Your Larva and Eat It Too

    Image of the Week

    During the larval stage, the Nemertean worm develops inside a hollow sac from which the juvenile eventually emerges, rupturing the sac and then eating the remains.

  • One Bone, Two Bones...

    One Bone, Two Bones...

    Image of the Week

    This short-tailed fruit bat embryo shows a pattern of bones in its limbs characteristic of all tetrapods: one bone, two bones, lots of bones, digits. 

  • Double, Double, Toil and Trouble

    Double, Double, Toil and Trouble

    Image of the Week

    Two views of a late pupa of an unidentified midge species (family Chironomidae).

  • 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.

  • 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.

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