The mutagens, urethane, ethyl urethane, hydrogen peroxide, desoxycholate, versene, maleic hydrazide, butadiene dioxide, and triethylene melamine, all increase the proportion of virus-producing cells and streptomycin-resistant cells in B. megatherium 20δ cultures to about the same extent. Acriflavine has no effect on the proportion of either type of cell. Triethylene melamine appears to cause mutations to occur without cell division.

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