About the Cover

The images depict: (left) Ronald M Evans pictured in 1985 with a sequencing gel from the GR and MR projects; (right) the superposition of helix 12 and the preceding loop in human MR and human GR, from Baker & Katsu 234 T1–T16. Credit: (left) Salk Institute for Biological Studies, La Jolla, CA, USA; (right) M E Baker (University of California) & Y Katsu (Hokkaido University)