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Gladius Following on from my post yesterday ... the clear, plastic-looking feather, is in fact the internal structure from a squid, also called a 'pen'... | By Mango SEA Science Education Art
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Preparation and characterization of high purity β-chitin from squid pens (Loligo chenisis) - ScienceDirect
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PPT - Squid Pen Invertebrate, no shell, but gladius (internal supporting structure) PowerPoint Presentation - ID:5402846
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