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This animation shows how mutations in an ion channel protein lead to the genetic disease cystic fibrosis. The animation also discusses how research on this protein has been used to develop treatments for the disease.

This animation describes how skin color is generated by skin cells as protection against ultraviolet (UV) radiation.

This animation provides an overview of the greenhouse effect, a process that warms the atmosphere and surface of Earth.

This film describes natural selection and adaptation in populations of rock pocket mice living in the American Southwest.

This animation shows how a mutation that allows adult humans to digest milk can be lost or spread under different circumstances.

This animation shows how varying concentrations of a signaling molecule activate different transcription factors to determine cell fate.

This animation shows how HIV infects a cell and replicates itself using reverse transcriptase.

This animation shows how stem cells from early mammalian embryos can be grown and studied in a laboratory.

This animation describes the formation and fates of the three germ layers in a human embryo.

This animation shows how salamanders can replace missing limb tissues with the help of cells similar to stem cells.

This video explores the evolution of a stickleback fish population over tens of thousands of years, based on fossil data.

This animation shows how quickly an advantageous mutation can spread through a mouse population over multiple generations.