Classify amino acids based on their structure and physicochemical properties. Provide examples for each category.

Amino acids are the building blocks of proteins, and they can be classified based on their structure and physicochemical properties. This classification helps in understanding their role in protein structure and function, as well as their behavior in different physiological conditions.

Classification Based on Structure

Amino acids can be classified based on the type of their side chain (R-group) into four major categories:

1. Non-polar (Hydrophobic) Amino Acids:
   These amino acids have non-polar, aliphatic or aromatic side chains that do not interact favorably with water molecules. As a result, they are typically found in the interior of proteins, away from the aqueous environment, where they contribute to the stability of protein structures.
   Examples:

   • Glycine (Gly): The simplest amino acid, with a hydrogen atom as the side _______ _______ ______ _________ _____ _______ _______ _______ _________ _____ _________.
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