Western blot analysis was performed as described [7 (link)]. Proteins were detected by the Odyssey 9120 Infrared Imaging System (Li-Cor Biosciences, Lincoln, Nebraska, USA). The antibodies used were anti-MGMT (Merck Millipore, Billerica, Massachusetts, USA), anti-HSP90, anti-beta-actin (Santa Cruz Biotechnology, Heidelberg, Germany), anti-MSH2 (Calbiochem, San Diego, CA, USA), anti-MSH6 (Transduction Laboratories, Lexington, KY, USA) and anti-MLH1 (BD Pharmingen, Heidelberg, Germany).
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