GNU Collaborative International Dictionary of English
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Found one definition
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octamer (ŏkˈtŭ‑mẽr), n. [Octa- + Gr. μέρος part.] (Chem.) A molecule composed of eight monomer units bound to each other, usually in a linear array; as, “an octamer formed from eight nucleotides is called an octanucleotide”.
[PJC]
An example of an octapeptide might be represented using the standard abbreviations for the component amino acids, e.g.:
met-ala-ser-glu-lys-ala-val-gly
An octanucleotide might be represented using the standard single-letter abbreviations for the component mononucleotides, e.g.:
ATGCATGC.
[PJC]