Proteins are composed of building blocks called amino acids. There are 20 standard amino acids that are used to build proteins in living organisms. Of these 20 amino acids, nine are considered essential, meaning they must be obtained through the diet because the body cannot synthesize them.
In addition to these standard amino acids, there are also non-standard or atypical amino acids that can be found in certain proteins or produced in specific organisms. However, the core set of building blocks for proteins remains the 20 standard amino acids.
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