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Throughout the process, Huml also uses a variety of machines to clean the air, including air scrubbers, deodorizing hydroxyl generators and negative air machines that clean the air and push it outside.

This is because hydroxyl radicals form in the atmosphere close to the ground during the day when the sun shines.

This is because iron and H₂O₂ react in what's known as the Fenton reaction, producing hydroxyl radicals, destructive molecules that attack DNA and RNA indiscriminately.

The third acid group of the citric acid then reacts with the hydroxyl group on the same molecule.

"This incision by ERCC1-XPF creates a markable free hydroxyl group in the DNA, enabling us to sequence DNA and locate these breaks," explains Dr. Son.