No abstract available
MeSH terms
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Bacteria / drug effects*
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Bacteria / genetics
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Cephalosporins / pharmacology*
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Czechoslovakia
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Penicillin Resistance
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Penicillins / pharmacology*
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R Factors
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Trimethoprim / pharmacology*
Substances
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Cephalosporins
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Penicillins
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Trimethoprim