RAPID GENE-SPECIFIC REPAIR OF CISPLATIN LESIONS AT THE HUMAN DUG DHFRLOCUS COMPRISING THE DIVERGENT UPSTREAM GENE AND DIHYDROFOLATE-REDUCTASE GENE DURING EARLY G(1) PHASE OF THE CELL-CYCLE ASSAYED BY USING THE EXONUCLEOLYTIC ACTIVITY OF T4 DNA-POLYMERASE (VOL 91, PG 10977, 1994)/