Abstract
The tumor-forming potential of polyoma-transformed mouse cells was found to be diminished but not eliminated after growth in the presence of 5-bromodeoxyuridine (BUdR). Several in vitro characteristics of the cells were also investigated and those which best correlated with the tumor studies were the ability to form colonies either in agar suspension or on monolayers of non-transformed cells. Transformed cells treated with BUdR grew well in culture when plated above a certain critical number of cells per unit area and poorly when plated at lower densities. Non-transformed cells exposed to BUdR for two or three passages were unable to divide.
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