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Alternatives to Laboratory Animals - ATLA

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Validation of the Postimplantation Rat Whole-embryo Culture Test in the International ECVAM Validation Study on Three In Vitro Embryotoxicity Tests


Aldert H. Piersma, Elke Genschow, Aart Verhoef, Marielle Q.I. Spanjersberg, Nigel A. Brown, Madeleine Brady, Angie Burns, Nicole Clemann, Andrea Seiler and Horst Spielmann

A detailed report is presented on the performance of the postimplantation rat whole-embryo culture (WEC) test in a European Centre for the Validation of Alternative Methods (ECVAM)-sponsored formal validation study on three in vitro tests for embryotoxicity. Twenty coded test chemicals, classified as non-embryotoxic, weakly embryotoxic or strongly embryotoxic on the basis of their in vivo effects in animals and/or humans, were tested in four laboratories. The outcome showed that the WEC test can be considered to be a scientifically validated test, which is ready for consideration for use in assessing the embryotoxic potentials of chemicals for regulatory purposes.