Contents

22 May 2012
Vol 5, Issue 225

About The Cover

Cover image expansion

Online Cover This week features a Perspective that discusses the structural analysis of S1P1, a G protein–coupled receptor for sphinogosine 1-phosphate. The image shows the superposition of the crystal structures of 11 G protein–coupled receptors. [Image: Abby L. Parrill/The University of Memphis]