Ptashne, Mark. A genetic switch : phage [lambda] and higher organisms / by Ma rk Ptashne. - 2nd ed. - Cambridge, Mass. : Blackwell Scientific Publications, c1986. - x, 192 p. : ill. ; 23 cm. Includes bibliographical references and index. Subjects--Topical Terms: Bacteriophage lambda --Genetics.------Gene expression regulation.--Genetics.------Genes, Viral.--Genetics.------ National Library of Medicine Call No.: QW 161.5.C6 / P959g 1987