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Le-Ruppert, K. and Masters, J. R. and Knuechel, R. and Seegers, S. and Tainsky, M. A. and Hofstaedter, Ferdinand and Buettner, R. (1992) The effect of retinoic acid on chemosensitivity of PA-1 human teratocarcinoma cells and its modulation by an activated N-ras oncogene. International Journal of Cancer 51 (4), pp. 646-651.