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Chitin
editIn wikipedia you can read the following
"Cuttlefish possess an internal structure called the cuttlebone, which is porous and is made of aragonite". Here it says chitin. I believe chitin is a minor constituent of the gladius and that this must be altered to reflect the reality. Quite sure. However, i am not an expert, there are lots, so I wont do it. — Preceding unsigned comment added by Bsviu (talk • contribs) 09:30, 5 February 2021 (UTC)