Abstract

Electron microscopic observations have been made on the outer cell envelopes of Chlamydia trachomatis, the agent of trachoma. It has been shown that they contain a hexagonal lattice with a unit cell of about 17·5 nm. Computer processing has been carried out on the hexagonal array and on ring-like particles occurring in fragmented envelopes. The structure of these rings can be related to the distribution of material in a three-dimensional model obtained for the hexagonal lattice. This model has been compared with biochemical data for the cell envelopes.

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