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Amphoteric

Capable of reacting as either an acid or a base.

A property of molecules such as amino acids that can donate a proton (acid) or accept a proton (base) depending on the surrounding pH.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
A property of molecules such as amino acids that can donate a proton (acid) or accept a proton (base) depending on the surrounding pH.

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