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Front Cover: 



Filaments of oxygenic cyanobacterium, which are involved in the 

 deposition of modern laminated sediments. The laminated sediments 

 are believed to be analogous to those found preserved in rocks from the 

 prePhanerozoic. Filaments are 4 micrometers in diameter. 



(Nomarski Optics, Courtesy of J. F. Stolzj 



