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Animals
2
Anti-Bacterial Agents
2
Cattle
2
Culture Media
2
Lactococcus lactis
2
Microbial Sensitivity Tests
Milk
Mutation
2
Penicillin Resistance
2
Penicillins
2
animal
2
antiinfective agent
2
article
2
beta lactam
2
beta-Lactams
2
cattle
2
culture medium
2
drug effect
2
genetics
2
growth, development and aging
metabolism
2
microbiological examination
2
microbiology
2
milk
mutation
2
penicillin derivative
2
penicillin resistance
2
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1
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2