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Billion-Year-Old Algae and Newer Genes Hint at Land Plants’ Origin
A recently unearthed fossil and new genomic discoveries are filling important gaps in scientists’ understanding of how primitive green algae eventually evolved into land vegetation.
New Clues About ‘Ambigram’ Viruses With Strange Reversible Genes
For decades, scientists have been intrigued by tiny viruses whose genetic material can be read both forward and backward. New research begins to explain this puzzling property.
Cell-Bacteria Mergers Offer Clues to How Organelles Evolved
Cells in symbiotic partnership, sometimes nested one within the other and functioning like organelles, can borrow from their host’s genes to complete their own metabolic pathways.
Math Reveals the Secrets of Cells’ Feedback Circuitry
Maintaining perfect stability through negative feedback is a basic element of electrical circuitry, but it’s been a mystery how cells could do it — until now.
Bacterial Clones Show Surprising Individuality
Genetically identical bacteria should all be the same, but in fact, the cells are stubbornly varied individuals.
Cellular Life, Death and Everything in Between
The discovery that apparently dead cells can sometimes resurrect themselves has researchers exploring how far they can push the point of no return.
The Body’s Clock Offers a Rhythmic Target to Viruses
Viruses and other parasites may sync with their host’s biological clock — or reset it — to gain an advantage.
Stem Cells Remember Tissues’ Past Injuries
Stem cells seem to retain memories of old injuries to improve future healing. When that system goes wrong, chronic inflammation can result.
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.