KENNETH EWARD / SCIENCE PHOTO LIBRARY KENNETH EWARD / SCIENCE PHOTO LIBRARY
Three caffeine molecules bound to the active site of a chitinase digestive enzyme. Although better known as the active ingredient in a morning cup of coffee, caffeine's original and principal use is by plants to deter herbivores. It does so through a moderate inhibition of several key enzymes. The image is a digital computer model based on real molecules. Magnification: 60 million times at 5''x7'' printed size.
Model release not required. Property release not required.