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By their side chains. All amino acids have this structure:

HOOC- C - NH2

Attached to that middle C is the side chain. They can have many different properties-

They can be aromatic, polar, lipophilic, basic, acidic, Sulfur containing, among others

There are 20 amino acids inside the human body, each has a different structure and function, due to its properties.

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17y ago

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