| Page 12 of 12 Acknowledgments
We thank Clemens Dasenbrock (Hannover, Germany) for supervising the in vivo experiments and Volker Rehse (Hannover, Germany) for performing them. Furthermore, we thank Christian Scheler, Proteome Factory (Berlin, Germany) for performance of the two dimensional gel-electrophoresis and protein identification by MALDI-MS.
 Footnotes
 
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1 Supported by the "Sächsische Aufbaubank" (Dresden/Germany) Project 6261, and the Fraunhofer-Society (München/Germany).
 
2 To whom requests for reprints should be addressed, at RESprotect, Fiedlerstr. 34, D-01307 Dresden, Germany. Phone: +493514503201; Fax: +493514503210; E-mail: 
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3 The abbreviations used are: BVDU, (E)-5-(2-bromovinyl)-2'-deoxyuridine; DOX, doxorubicin; MMC, mitomycin C; MXA, mitoxantrone; MALDI-MS, matrix-assisted laser desorption/ionization mass spectrometry; HOPI, Hoechst 33258/propidium iodide; DMBA, dimethylbenzanthrazene; CGH, comparative genome hybridization; ROS, reactive oxygen species.
 
4 Two-dimensional gel electrophoresis and MALDI-MS were performed by Proteome Factory (Berlin, Germany, http://www.proteomefactory.com).
 
5 R. Fahrig, J-C. Heinrich, F. Wilfert, C. Praha, D. Sonntag, unpublished observations.
 
Received  5/12/03. 
Accepted  7/14/03.
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