“The presence of the nucleic acid inhibitor, either 2 mM hydroxyurea, … arabinofuranosyl cytosine, 2 mM excess dThd or 5 microg/ml of actinomycin D (AMD) during 2- to 24-h chase periods after a 2 … postirradiation label prevents the repair to various extents, while 2 mM caffeine completely … it.”