Pulse Dipolar Electron Spin Resonance: Distance Measurements by Peter P. Borbat, Jack H. Freed.Interpretation of Dipolar EPR Data in Terms of Protein Structure, by Gunnar Jeschke.Site—Directed Nitroxide Spin Labeling of Biopolymers, by Sandip A. Shelke and Snorri Th. Sigurdsson. Metal—Based Spin Labeling for Distance Determination, by Daniella Goldfarb. Structural Information from Spin—Labelled Membrane—Bound Proteins, by Johann P. KLare, Heinz—Jürgen Steinhoff. Structural Information from Oligonucleotides, by Richard Ward and Olav Schiemann. Orientation selective DEER using rigid spin labels, cofactors, metals, and clusters, by Claudia E. Tait, Alice M. Bowen, Christiane R. Timmel, Jeffrey Harmer