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phage group
The phage group (sometimes called the American Phage Group) was an informal network of biologists centered on Max Delbrück that contributed heavily to bacterial genetics and the origins of molecular biology in the mid-20th century. The phage group takes its name from bacteriophages, the bacteria-infecting viruses that the group used as experimental model organisms. In addition to Delbrück, important scientists associated with the phage group include: Salvador Luria, Alfred Hershey, Seymour Benzer, Gunther Stent, James D. Watson, Frank Stahl, and Renato Dulbecco.
==Origins of the phage group: people, ideas, experiments and personal relationships==
Bacteriophages had been a subject of experimental investigation since Felix d'Hérelle had isolated and developed methods for detecting and culturing them, beginning in 1917. Delbrück, a physicist-turned biologist seeking the simplest possible experimental system to probe the fundamental laws of life, first encountered phage during a 1937 visit to T. H. Morgan's fly lab at Caltech. Delbrück was unimpressed with Morgan's experimentally complex model organism ''Drosophila'', but another researcher, Emory Ellis, was working with the more elementary phage. During the next few years, Ellis and Delbrück collaborated on methods of counting phage and tracking growth curves; they established the basic step-wise pattern of virus growth (the most obvious features of the lytic cycle).〔Morange, ''A History of Molecular Biology'', pp 41-43〕
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