Louise P. Cramer

The Randall Institute, Kings College London, 26-29 Drury Lane, London WC2B 5RL, UK.

Received 5/21/97; Accepted 5/26/97

7. ACKNOWLEDGMENTS

I thank Clare Waterman-Storer and Ted Salmon for kindly sharing their data before they submitted it for publication, and Patrick Jay for kindly sending me a chapter from his PhD thesis. I also thank Alex Mogilner, George Oster, Phillip Gordon-Weeks, and Daniel Zicha for their very helpful suggestions and comments on the manuscript. I am very grateful to Tim Mitchison for his excellent support and many stimulating discussions while I was a postdoctoral fellow in his laboratory. Work in my laboratory is supported by the Wellcome Trust, UK.