Acknowledgements
We wish to acknowledge the excellent assistance received from Rune
Fledelius Jensen and Julia Sid Hansen at the Department of Infectious
Disease Immunology at Statens Serum Institut. As well as the
experimental animal facilities at Statens Serum Institut for animal
handling, particularly Jan Villumsen, for his excellent help with the
activity monitoring system. The study was supported by the Danish
3R-Center (to G.K.P) and Independent Research Fund Denmark (grant no.
9041-00160B to J.Z.).