A surprise DNA layer. DNA seems like a pretty straightforward code: three letters in, one amino acid out. Now, it turns out there's a hidden layer. Scientists have long known that different codons can spell the same thing, but not behave the same way. That's because of a protein that can spot "inefficient" genetic instructions and shut them down. While this is a subtle tweak to how cells read the code of life, it's one that could reshape how we understand everything from development to disease.
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