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| PR:P02919 | penicillin-binding protein 1B (Escherichia coli K-12) | | |  | | |
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| PR:P02919-1 | penicillin-binding protein 1B isoform Alpha (Escherichia coli K-12) | | |  | | |
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| PR:P02919-2 | penicillin-binding protein 1B isoform Gamma (Escherichia coli K-12) | | |  | | |
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| PR:P40750 | penicillin-binding protein 4 (Bacillus subtilis subsp. subtilis str. 168) | | |  | | |