Abstract
Many tissues which are covering the surface of animals show fibrillar organizations which are similar to that of molecules in cholesteric liquid crystalline phases. Cholesteric and other liquid crystalline-like organizations are encountered in extracellular matrices made of various components. We present a review of different results obtained in electron microscopy on collagenous extracellular matrices, especially that of marine worms whose cuticle represents the interface of the organisms with their environmen

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