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Two cryptic plasmids designated PO-1 and PO-2 that had molecular weights of 1.5 x 10(6) and 45 x 10(6) daltons, respectively, were isolated from Salmonella pullorum MS53. A 150 to 1 ratio of PO-1 to PO-2 plasmids was estimated to occur.
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Olsen et al. (1972) studied this question.
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