Sea urchin spine, transverse section

Sea urchin spine, transverse section

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Caption: Sea urchin spine. Polarised light micrograph of a transverse section through a spine from the edible sea urchin (Echinus esculentus). The polarised light has revealed the layers of the calcium carbonate that makes up most of a sea urchin's spine. These spines are designed to protect the sea urchin from predators, and some carry poison glands that can infect those that step on them. Magnification: x36 when printed at 10 centimetres across.

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Keywords: anatomical, anatomy, animal, biological, biology, calcium carbonate, close-up, cross-section, defence, defence mechanism, defense, detail, details, echinodermata, echinus esculentus, edible sea urchin, fauna, histological, histology, invertebrate, invertebrates, light micrograph, light microscope, lm, marine biology, mineral, nature, poison, poisonous, polarised, polarized, sea urchin, section, sectioned, spine, transverse, wildlife, zoological, zoology

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