ATPase is gear-like and present in all living things (to the best of my knowledge): http://www.psc.edu/science/schulten2004.html http://www.psc.edu/science/schu

ATPase is gear-like and present in all living things (to the best of my knowledge): http://www.psc.edu/science/schulten2004.html http://www.psc.edu/science/schulten2004.html