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This four-part animation series explores the biology of the virus SARS-CoV-2, which has caused a global pandemic of the disease COVID-19.

This film tells the story of the scientists and the evidence involved in one of the most important scientific quests of the 20th century: the discovery of the structure of DNA.

This animation shows how a variety of proteins interact to regulate the transcription of eukaryotic DNA into RNA.

This animation shows how dengue virus infects a cell and replicates itself with the help of its host’s cellular machinery.

This animation explores the chemical components and bonds of the nucleotides that make up DNA.

This animation describes PCR, a standard laboratory technique for making many copies of a specific DNA sequence.

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

This animation shows how a medication called AZT, which is a reverse transcriptase inhibitor, can be used to treat HIV/AIDS.

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 animation describes the typical ratios of bases in DNA.