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The hybrids between Krushinsky Molodkina (KM) inbred strain, selected for high predisposition to audiogenic epilepsy (AE), and Wistar rats non prone to audiogenic seizure were the initial population for selection. Rats were selected for the trait "the absence of audiogenic seizure proneness". The creation of such strain in which the significant proportion of animals develop no AE in response to sound and share partly the genetic background of the KM strain is very important for the correct use of KM strain as the laboratory model of seizure states. As alleles which determine the AE proneness are recessive the selection for the "oppo site" trait proceeds necessarily slow.