Book excerpt: This volume provides researchers with protocols that help them investigate known or putative O2 sensing proteins and pathways. The chapters in this book discuss techniques ranging from anaerobic redox midpoint measurement to approaches to control expression of globin genes, which provide detailed methods for researchers interested in expanding their knowledge of O2 sensing systems. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Authoritative and comprehensive, Oxygen Sensing: Methods and Protocols is a valuable resource to a wide audience, ranging from microbiologists and cell biologists, to protein biochemists.