Fig. 4From: PROKARYO: an illustrative and interactive computational model of the lactose operon in the bacterium Escherichia coli β-galactosidase metabolism. Upon collision, β-galactosidase metabolizes lactose molecules into glucose and galactose. The lactose molecules are represented as half red and half green spheres. All red spheres depict glucose molecules; green spheres represent galactoseBack to article page