1. The
Molecular Motors Laboratory, The Beatson Institute for Cancer Research, Garscube
Estate, Switchback Road, Glasgow G61 1BD, Scotland, U.K.
2. Drug Discovery Programme, The Beatson Institute for Cancer Research, Garscube
Estate, Switchback Road, Glasgow G61 1BD, Scotland, U.K.
3. Department of Biological Sciences, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh,
Pennsylvania 15213, United States