Abstract
A tremendous increase in our knowledge of the variety of retroviral transforming genes and their complexity of structure and function has been attained within the last decade. Rapidly transforming, replication-defective retroviruses have gained a prominent position as systems to exploit in the study of the interactions of specific growth control genes and their host cells. A large number of independent isolates of such viruses from diverse vertebrate species (see Coffin et a1.1980) have been documented. The phenomenon of a specific host cell gene being recombined with part of the sequences of a replication-competent retrovirus and, hence, generating a new viral form and function has been demonstrated at the biological and molecular levels for a number of cases.
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