[The biological effects in animals related to the accident at the Chernobyl Atomic Electric Power Station. 6. The physiological development and cytogenetic indices of the progeny of rats].

Certain alterations have been revealed in the postnatal ontogenesis parameters of albino mongrel rats and their descendants constantly kept within the thirty-kilometer zone of the Chernobyl A.P.S. Structural disturbances have been found in bone marrow cell chromosomes.