Lesion DNA synthesis Xeroderma Pigmentosum Variant yeast two-hybrid assayAcknowledgmentsWe thank Drs. Roger Woodgate and Fumio Hanaoka for providing us with Pol and Pol cDNA, respectively and Dr. Yuji Masuda for anti-REV1 antibody. This study was supported by grants-in-aids (17013041, 16370077 to H.O. and 17770003 to E.O.) from the Japanese Ministry of Education, Culture, Sports, Science and Techn