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molecular biology

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botany

Unexpected ‘Germline’ Plant Cells May Shield New Generations

To avoid passing on new mutations to offspring, plants may minimize the number of divisions by the stem cells that make flowers and seeds.

Art for "Ancient DNA Yields Snapshots of Vanished Ecosystems"
genomics

Ancient DNA Yields Snapshots of Vanished Ecosystems

Surviving fragments of genetic material preserved in sediments allow scientists to see the full diversity of past life — even microbes.

Art for "Mitochondria Direct the Fate of Stem Cells by Shape-Shifting"
developmental biology

Biologists Discover Unknown Powers in Mighty Mitochondria

Mitochondria are most famous as sources of metabolic energy. But by splitting and combining, they can also release chemical signals to regulate cell activities, including the generation of neurons.

Q&A

Doudna’s Confidence in CRISPR’s Research Potential Burns Bright

Jennifer Doudna, one of CRISPR’s primary innovators, stays optimistic about how the gene-editing tool will continue to empower basic biological understanding.

Art for "Fragile DNA Enables New Adaptations to Evolve Quickly"
evolution

Fragile DNA Enables New Adaptations to Evolve Quickly

If highly repetitive gene-regulating sequences in DNA are easily lost, that may explain why some adaptations evolve quickly and repeatedly.

Art for "Adaptations or Neutral Changes? Evolutionary Theory Seeks a Balance"
evolution

Theorists Debate How ‘Neutral’ Evolution Really Is

For 50 years, evolutionary theory has emphasized the importance of neutral mutations rather than adaptive ones at the level of DNA. Real genomic data challenges that assumption.

Art for "Scientists Learn the Ropes on Tying Molecular Knots"
chemistry

Scientists Learn the Ropes on Tying Molecular Knots

As chemists tie the most complicated molecular knot yet, biophysicists create a “periodic table” that describes what kinds of knots are possible.

Thaumatophyllum bipinnatifidum leaf
botany

DNA Analysis Reveals a Genus of Plants Hiding in Plain Sight

Gene-sequence data is changing the way that botanists think about their classification schemes. A recent name-change for a common houseplant resulted from the discovery that it belonged in an overlooked genus.

Illustration for "How Many Genes Do Cells Need? Maybe Almost All of Them"
genomics

How Many Genes Do Cells Need? Maybe Almost All of Them

An ambitious study in yeast shows that the health of cells depends on the highly intertwined effects of many genes, few of which can be deleted together without consequence.