1. London Research Institute, Cancer Research UK, London WC2A 3LY, UK.
2. Peter Gorer Department of Immunobiology, King’s College School of Medicine at Guy’s Hospital, London SE1 9RT, UK.
3. Department of Histology and Embryology, University of Rijeka School of Medicine, Braće Branchetta 20, HR-51000 Rijeka, Croatia.