title: The authors' reply.
authors.affiliation: Centre for Environmental Contaminants Research, CSIRO Land and Water, Glen Osmond, Adelaide, Australia.
authors.forename: Anu
authors.initials: A
authors.lastname: Kumar
authors.affiliation: Centre for Environmental Contaminants Research, CSIRO Land and Water, Kirrawee, New South Wales, Australia.
authors.forename: Graeme E
authors.initials: GE
authors.lastname: Batley
authors.affiliation: School of Biological Sciences, University of Plymouth, Plymouth, United Kingdom.
authors.forename: Thomas H
authors.initials: TH
authors.lastname: Hutchinson