A major success story of modem molecular biology is the development of technologies to clone and express specific genes. Current applications of recombinant gene products cover a wide spectrum, including gene therapy, production of bioactive pharmaceuticals, synthesis of novel biopolymers, agriculture and animal husbandry, and so on. Inherent in bringing these appli- cations to fruition is the need to design "expression constructs" that will per- mit the ready and specific detection and isolation of the defined recombinant gene products. Recombinant Protein Protocols grows out of the need for...