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GUELPH, Ontario — Outside of Emma Allen-Vercoe’s office is a bulletin board pinned with her team’s scientific papers since 2013. It’s the academic’s answer to a military uniform grown heavy with medals.

But all of that research has come with a side effect: an impressive intimacy with the smells of human digestion.

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“This is what we formally call the poopy lab,” she said one morning at the end of January. “Every donor that we use has a distinct aroma, because they have a different profile of microbes in the gut, so it’s like a fine wine — just not quite so fine. I guess this is Eau de Ulcerative Colitis … which smells different from Eau de Obesity, and Eau de Healthy Person.”

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