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β-Galactosidase activity of AX2 cells transformed with a rnrB-ile-αpgal fusion construct upon treatment with 10 mM MMS, 5 µg/ml 4NQO or 30 J/m2 UV. Cells were treated 4 h after initiation of development. Protein samples were taken periodically and assayed for β-galactosidase activity.
