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Fine Structure of Cribellate Spider Silk

Victor L. Friedrich, Jr. and Rudolph M. Langer
American Zoologist
Vol. 9, No. 1 (Feb., 1969), pp. 91-96
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/3881493
Page Count: 6
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Fine Structure of Cribellate Spider Silk
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Abstract

Sticky silk from webs of the spiders, Uloborus diversus and Filistata arizonicus, were examined by electron microscopy. The silk of U. diversus contains long fibrils, 200-300 Å in diameter, consisting of an electron-dense central filament, 30-60 Å across, embedded in a lighter matrix. Transverse banding is distinguished in the matrix at intervals from over 200 to less than 50 Å. Similar features are observed in the silk of F. arizonicus. Extended fibrils have an altered structure.

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