Rod-like projections on the surface of have been studied by a combination of computer image analysis and electron microscopy. the rods, . 60-80 Å in diameter and . 500 Å in length, were found on the surface of prokaryocells of inserted in the cytoplasmic membrane through a ring-like structure in the outer membrane. the rod-like structures were found at all stages of the life cycle, even in very small elementary bodies (EBs) of and in vesicles < 0.2 m. Computer image analysis of isolated rods indicated that they comprise helically arranged subunits with a periodicity of . 50 Å. From their localisation and distribution, these structures may be related to the proliferation, or to the infectivity, of chlamydiae.


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