21 May 2013
Vol 6, Issue 276

About The Cover

Cover image expansion

Online Cover This week features a Research Article that suggests that G protein α-subunits switched from being self-activating to requiring an activating receptor as eukaryotic organisms evolved. The image shows the phylogenetic analysis of regulators of G proteins, as well as three different types of domain architecture. [Image: Daisuke Urano, Department of Biology, University of North Carolina at Chapel Hill, NC, USA]