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Next, the team equipped modern Pseudomonas protegens bacteria with a pair of ancient genes to make proteins that produce milligrams’ worth of a molecule called a furan.

Pulp mills stopped dumping “black liquor,” a paper byproduct, into the water and Environment Canada began testing for waterborne carcinogens, like dioxins and furans, that had decimated fisheries.

Acrylamide and furan are two compounds commonly found in coffee that are produced when the beans are roasted.

They include chemicals such as furan, benzene and formaldehyde, as well as aerosols in microscopic particles that can penetrate human lungs.

Chemicals such as dioxins and furans, which are classified as “likely human carcinogens” by the U.S.