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In contrast, the more a baby was formula fed, the higher their levels of a metabolite called cadaverine, a known contaminant formed via fermentation.

Not everyone wants to sniff the compounds known as putrescine and cadaverine — this particular sample isn’t as awful as you might think — but many eagerly take part in the final display.

An overwhelming “cadaverine” stench hung in the air on Aimee Beveridge’s wooded, 10-acre property on Orcas Island, a destination better known for salty sea scents or its fragrant firs.

Lysine and ornithine have very similar molecular structures, and the authors found that Spe1, the enzyme that decarboxylates ornithine, can also decarboxylate lysine to generate cadaverine.

It turns out that death, in odor form, is indeed straightforward: a couple of relatively coöperative naturally occurring chemicals, putrescine and cadaverine, are responsible for the characteristic smell of a decaying corpse.