See also:

http://www.eecs.mit.edu/AY06-07/announcements/11.html

http://lmrt.mit.edu/Publications/Proteolytic%20Actuation%20of%20Nanoparticle%20Self-Assembly.pdf

http://www.physorg.com/news89466839.html

http://www.innovations-report.de/html/berichte/biowissenschaften_chemie/bericht-77974.html

http://www.nanotech-now.com/news.cgi?story_id=20095