Maraglas-embedded sections of periodontal membranes around continually growing incisors of Sprague-Dawley rats fixed consecutively in cold glutaraldehyde and Palade's 1 % buffered osmium tetroxide were examined under the electron microscope for oxytalan connective tissue fibers. Oxytalan fibers were noted to consist of bundles of filaments approximately 150 A in diameter with an interfilamentous amorphous substance of approximately the same diameter. A periodicity of fibrillar elements was not obvious.

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