1. Laboratory for Toxicology, Pathology, and Genetics, RIVM, TOX 12, PO Box 1, NL-3720 BA Bilthoven, The Netherlands, Laboratory for Ecological Risk Assessment, RIVM, Bilthoven, The Netherlands, Expert Centre for Substances, RIVM, Bilthoven, The Netherlands, and Centro de Ciencias do Mar, Centro de Investigacao Marinha e Ambiental-Laboratorio Associado, University of Algarve, Campus de Gambelas, Faro 8005-139, Portugal