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SUMMARY: A strain of Rhizobium trifolii and four phage-resistant derivatives had different mutation frequencies to phage resistance. One mutant adsorbed the phage to which it was resistant; the others showed little or no adsorption. Differences between the strains in the number and nature of ionizable surface groups were revealed by micro-electrophoresis. Two of the resistant mutants were lysed by lysozyme and three by lipase. Lysozyme + EDTA lysed all strains, but at different rates.
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