During the 1960s, Howard M. Temin (1934--1994), dared to advocate a "heretical" hypothesis that appeared to be at variance with the central dogma of molecular biology, understood by many to imply that information transfer in nature occurred only from DNA to RNA. Temin's provirus hypothesis offered a simple explanation of both virus replication and viral-induced cancer and stated that Rous sarcoma virus, an RNA virus, is replicated via a DNA intermediate. Popular accounts of this scientific episode, written after the discovery of an RNA-directed DNA polymerase in 1970, tend to describe the reaction to his proposition as ardent opposition. Typically these accounts use a molecular biology' standpoint emphasizing the central dogma's part in its rejection. In this article, however, this episode will be examined from a joint perspective of virology and experimental cancer research. From this perspective it is clear that Temin's work was well within the epistemological and methodological boundaries of virology and cancer research. Still, scientists did have reasons to doubt the provirus hypothesis, but these do not seem to be good enough to either justify an account that portrays Temin as a renegade or his ideas as heretical.
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