Comment by kurthr

It's interesting to me that they don't mention Miraculin, which has long known to cause sour things to taste sweet.

https://en.wikipedia.org/wiki/Miraculin

edit: I didn't find any nice connection between Otopetrin and Miraculin in the literature either... possibly because miraculin operates on the tongue's sweetness detectors which then override the sour taste like sugar in lemonade.