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Qualitative β-galactosidase assays
| promoter | qualitative β-galactosidase assay |
| lac | + |
| lac K5 | + |
| lac II | - |
lac wt: the wild type lac promoter
lac K5: the lac promoter containing the watermark sequence WWU
lac II: the lac promoter containing the watermark sequence 42
+: promoter is active
-: promoter is inactive
