+"15aa" denotes a chain of fifteen [amino acids](/wiki/Amino_Acid), the fundamental units of proteins. These short sequences are typically classified as [peptides](/wiki/Peptide), often acting as signaling molecules or precursors. Their precise arrangement dictates their unique biological function.
+## See also
+- [Protein](/wiki/Protein)
+- [Polypeptide](/wiki/Polypeptide)
+- [Biochemistry](/wiki/Biochemistry)
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