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Thin sections of an anaerobic filamentous oral organism possibly related to Leptotrichia buccalis have been examined in the electron microscope. The organism exhibited a cell wall profile characteristic of Gram-negative bacteria, viz. a solid membrane and an outer double-layered membrane. The outer membrane could be removed by treating intact cells with trypsin or phenol-water. The organism contained numerous intracytoplasmic vacuoles.
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