24 June 2008
Vol 1, Issue 25

About The Cover

Cover image expansion

COVER This week's issue features a Review that discusses how heterotrimeric guanosine triphosphate (GTP)-binding proteins (G proteins) may function as activated heterotrimers. This is in addition to the well-characterized abilities of dissociated α and βγ subunits to function independently. The image shows the structure of a heterotrimeric G protein, which consists of α (blue), β (purple), and γ (green) subunits and is based on PDB structure 1GP2. [Image: Chris Bickel, AAAS]