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Sequence of amino acids making up a polypeptide.
In addition to protein primary structure, see also protein secondary structure, protein tertiary structure, and protein quaternary structure.
The protein primary structure is the key determinant of how a protein folds and protein/polypeptide properties once folded. It is determined in the course of translation by the sequence of codons provided by messenger RNA which in turn are specified in the course of transcription by the sequence of nucleotides found in genes.
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