Researchers have found that cells can distinguish between strong and weak versions of the same genetic instructions. A protein called DHX29 helps silence the weaker ones, uncovering a hidden system that controls gene activity. Credit: Shutterstock Human DNA is built from long sequences of three-letter units made up of four nucleotides. These units, known as codons, tell cells which amino acids to use when building proteins. While several different codons can code for the same amino acid, this

Tag-uri: DNA