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Colorized transmission electron micrograph of a polyribosome.
origins of life

Life’s First Peptides May Have Grown on RNA Strands

By Yasemin Saplakoglu
May 24, 2022
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RNA and peptides coevolving in the primordial world might have jointly served as a precursor to the modern ribosome.

Illustration that combines elements of three- and four-leaf clovers with the letter for nucleotides in codons.
synthetic biology

Life With Longer Genetic Codes Seems Possible — but Less Likely

By Yasemin Saplakoglu
April 11, 2022
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Life could use a more expansive genetic code in theory, but new work shows that improving on three-letter codons would be a challenge.

Illustration of a doctor trying to get to a patient
molecular biology

Bacteria Sacrifice DNA Repair for Better RNA

By Jordana Cepelewicz
November 22, 2017
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Preserving its DNA ought to be a cell’s top priority. But bacteria slow their DNA repair to a crawl in favor of proofreading gene transcripts.

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