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- W1966581505 abstract "The present work was carried out to clarify the three-dimensional fine structure of extracellular matrix in the cornea, using ultrarapid-freezing and deep-etching methods for electron microscopy. Fresh and glutaraldehyde-fixed samples of human and rabbit posterior corneas were ultrarapidly-frozen onto a copper block cooled by liquid helium or liquid nitrogen, freeze-fractured, deeply etched for 8-10 min and rotary replicated with platinum-carbon. Replicas were examined in a transmission electron microscope equipped with a tilting device. Only structures with repeatedly observed, similar architectural profiles free from ice crystal damage, were taken into account. The very recognizable major collagen fibrils revealed 8-10 nm subfibrils running helically along the fibril long axis. The other extracellular matrix components consisted of: (1) 8-12 nm interfibrillar bridging filaments, frequently ornamented with globular domains, joining neighbouring collagen fibrils like steps of a ladder; (2) 10-20 nm filaments with relatively large globular domains, running on the surface of collagen fibrils along their long axes, and projecting finger-like structures into interfibrillar spaces sometimes attaching to adjacent collagen fibrils; (3) 10-15 nm beaded filaments with a periodicity of 75-110 nm, forming extended networks, especially at the interlamellar interfaces; and (4) 8-14 nm straight or sinuous strands consisting of 4-6 nm repeating subunits or modules, forming extended sheets by lateral association at the Descemet's membrane/stroma interface. In the light of the information available from studies on the localization of extracellular matrix components in the cornea, and by reference to the structural models of extracellular matrix molecules and macromolecular assemblies, we have related the deep-etched extracellular matrix structures described above to: (1) proteoglycans; (2) fibril-associated collagens with interrupted triple helices or FACIT collagens; (3) type VI collagen; and (4) fibronectin, respectively." @default.
- W1966581505 created "2016-06-24" @default.
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- W1966581505 date "2001-02-01" @default.
- W1966581505 modified "2023-10-18" @default.
- W1966581505 title "Three-dimensional Supramolecular Organization of the Extracellular Matrix in Human and Rabbit Corneal Stroma, as Revealed by Ultrarapid-freezing and Deep-etching Methods" @default.
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- W1966581505 doi "https://doi.org/10.1006/exer.2000.0935" @default.
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