Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.

Last updated: May 5th, 2025

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Sour taste was formerly thought to be one of the four taste receptor areas in the tongue, occurring along the sides of the tongue, and stimulated mainly by acids. We now know this is not the case as all tastes can be experienced by all parts of the tongue.

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