Previous Article Next Article Table of Contents Science, Vol.280, No.5365, 852-853, 1998 DOI10.1126/science.280.5365.852 Export Citation The era of pathway quantification Koshland DE Keywords:COVALENT MODIFICATION;SYSTEMS;ULTRASENSITIVITY;PHOSPHORYLATION;SENSITIVITY;CASCADE Please enable JavaScript to view the comments powered by Disqus.