Labelling of leukocytes, proliferating and apoptotic cells by immunohistology and the TUNEL method Leukocytes, proliferating and apoptotic cells in haemolymphatic tissue samples from 21 common shrews were identified using immunohistology and the TUNEL (terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labelling of DNA fragmentation sites) method respectively. For immunohistology, monoclonal and polyclonal antibodies (cross) reacting in other species were used in conjunction with peroxidase anti-peroxidase and avidin biotin peroxidase complex methods as previously described [36] [37] [38] [39] . Antibodies, their sources and detection methods are listed in Table 1 .