We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleSystems biology. Life's complexity pyramid.AuthorsOltvai ZN; Barabási ALPublicationScience (New York, N.Y.), 2002, Vol 298, Issue 5594, p763ISSN1095-9203Publication typearticleDOI10.1126/science.1078563