There can be no doubt that some ofthe most spectacular advances made in science over the past few decades have been in the isolation, analysis, and manipulation of nucleicacids. Thishas ledtoamuchgreaterunderstandingofmechanismsandprocesses across many fields of bioscience, such as biochemistry, microbiology, physiology, pharmacology, and the medical sciences to name a few. It has also led to the growth of the biotechnology industry, which seeks to develop and commercialize many ofthese important processes and methods. Much ofthis has come about because ofthe devel­ opment of numerous molecular biology and genetic manipulation techniques. The discovery of restriction enzymes and the development of cloning vectors in the early 1970sopenedthedoortowaysofisolatingandmanipulatingnucleic acidsthathadnever been thought possible. Gene probe labeling and hybridization were developed and refined toprovidepowerfulmethodsofanalysis. These-togetherwiththedevelopment of DNA sequencing methods, protein engineering techniques, and PeR-have all continued to contribute substantially to the understandingofbiological processes at the molecular level. Theprotocols for these importantmethods are the focus ofThe Nucleic AcidProtocols Handbook, whose aim is to provide a comprehensive set oftechniques in onevolume thatwill enable the isolation, analysis, and manipulationofnucleic acids to be readily undertaken. The NucleicAcidProtocols Handbook is divided into 10 parts; within each there are approximately 10chapters. The first fourpartsfollow oneanotherlogically: nucleic acid extraction (Part I), basic separation and analysisofDNA (II), through probe design and labeling (III), and RNA analysis techniques (IV). The following three sections deal with gene libraryconstruction andscreening(V), DNA sequencing (VI), andthe polymerase chain reaction (VII).