Protection of hematopoietic stem cells from pemetrexed toxicity by retroviral gene transfer with a mutant dihydrofolate reductase-mutant thymidylate synthase fusion gene. - Capiaux, Gina M; Budak-Alpdogan, Tulin; Alpdogan, Onder; Bornmann, William; Takebe, Naoko; Banerjee, Debabrata; Maley, Frank; Bertino, Joseph R (Cancer Gene Therapy, 2004)