Scrabble Dictionary

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Yes, octapeptide is playable

...and is worth 21 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Octapeptide" Definition

noun

A polypeptide, such as angiotensin, that is composed of eight amino acids.
A protein fragment or molecule (as oxytocin or vasopressin) that consists of eight amino acids linked in a polypeptide chain.

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