A molecule, usually a protein, that can act as either an acid or a base depending on the chemical environment around it.
From Greek 'amphi' (both) and '-lyte' (substance that dissolves or conducts electricity, from 'lysis'). Chemistry term coined to describe molecules with dual acid-base properties.
This is why your proteins don't fall apart in different parts of your body—they're ampholytes, constantly switching between acid and base to stay stable no matter where they are.
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