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Posttranslational modificationPosttranslational modification means the chemical modification of a protein after its translation. It is one of the possible steps in protein biosynthesis.
A protein is a chain composed of a long sequence of 20 possible amino acids, also called a polypeptide. Some posttranslational modification extends the range of possible functions a protein can have by introducing other chemical groups into the makeup of a protein (e.g., carbohydrate chains). Other modifications like phosphorylation are part of common mechanisms for controlling the behavior of a protein.
Types of posttranslational modifications include:
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