Acknowledgements

We thank Robert Josephs (University of Chicago) for his suggestion of using catalase as a test system and providing our initial specimen grids. Financial support and equipment was provided by the National Science Foundation (DBI-9730056) and the International Business Machines SUR program. Nahrstedt's research was supported by the National Science Foundation Career Grant (CCR-96-23867) and the National Computational Science Alliance. We are grateful to both the Beckman Institute and the National Center for Supercomputing Applications for institutional support.

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