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Mattern, I.E. (author), Greim, H. (author), Medisch Biologisch Laboratorium TNO (author)Bacterial systems for the screening of chemical substances for mutagenic potential are receiving widespread attention. Now that many laboratories have introduced these test systems and a large number of substances has been tested, discrepancies in the results have become apparent. To discuss this problem, a workshop was organized at Neuherberg ...article 1978