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| PR:A5I684 | dTTP/UTP pyrophosphatase (Clostridium botulinum A str. Hall) | | |  | | |
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| PR:P25536 | dTTP/UTP pyrophosphatase (Escherichia coli K-12) | | |  | | |
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| PR:O14141 | dTTP/UTP pyrophosphatase (Schizosaccharomyces pombe 972h-) | | |  | | |
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| PR:Q55G28 | nucleoside triphosphate pyrophosphatase (Dictyostelium discoideum) | | |  | | |