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  • 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.

  • Dante's Story

    Dante's Story

    Clip

    (6 min 6 sec) Dante is a 10-year-old boy born with hemimegalencephaly—an enlargement of half his brain.

  • The Search for Genetic Mutations that Cause Autism

    The Search for Genetic Mutations that Cause Autism

    Clip

    (2 min 5 sec) Dr. Christopher Walsh discusses how genomic science has made enormous contributions to our understanding of the genetic causes of autism.

  • Meet Dante—A Young Boy with Hemimegalencephaly

    Meet Dante—A Young Boy with Hemimegalencephaly

    Clip

    (2 min 33 sec) Dante is a healthy 10-year-old boy who has had half his cerebral cortex surgically removed to treat his seizures.

  • Development of the Cerebral Cortex

    Development of the Cerebral Cortex

    Animation

    (1 min 43 sec) Most of the neurons of the cerebral cortex arise from progenitor cells that undergo repeated cell division.

  • These Limbs Are Made for Walkin'...

    These Limbs Are Made for Walkin'...

    Image of the Week

    ... but that's not all they'll do. Several genes determine the diverse shapes and functions of crustacean appendages. 

  • Sizing Up the Brain Gene By Gene

    Sizing Up the Brain Gene By Gene

    Lecture

    (59 min 32 sec) Recent advances in DNA sequencing technology have led to a better understanding of the many genes that play a role in brain development.

  • How the Sea Anemone Gets Its Tentacles

    How the Sea Anemone Gets Its Tentacles

    Image of the Week

    The young starlet sea anemone forms tentacles by cell division, migration, and shape changes.   

  • The Eye of a Red-eyed Tree Frog at Rest

    The Eye of a Red-eyed Tree Frog at Rest

    Image of the Week

    Many animals have a third eyelid called a nictitating membrane that protects the eye.

  • Pearls or Stink Bug Eggs?

    Pearls or Stink Bug Eggs?

    Image of the Week

    A group of 14 stink bug eggs attached to the underside of a poplar leaf.

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