Give an example of a neutral amino acid.

Glycine is an example of a neutral amino acid. Neutral amino acids have one amino group and one carboxyl group, which balance each other electrically, making the overall molecule neutral at normal pH. Their side chains are not charged. Examples include glycine, alanine, valine, leucine, and isoleucine. 

Glycine, the simplest, has the formula NH₂CH₂COOH and lacks a side chain beyond hydrogen. Neutral amino acids are building blocks of proteins and play roles in enzyme formation and muscle tissue repair. 

Their neutral nature helps maintain proper protein structure and function in living cells.