Co-expression of immune proteins granulysin, granzyme A, granzyme B and perforin with immune cell marker CD45 or epithelial marker EPCAM. Granzyme A, granzyme B and granulysin were all co-expressed with CD45 (0.3%, 5.0% and 2.8% respectively) positive cells (a(i–iii)), whereas little co-expression was found between the immune proteins and the epithelial cell marker EPCAM (0.1%, 1.4% and 2.8% respectively) (b(i–iii)). Superposition of the co-expression of granulysin, granzyme B and granzyme A in CD45+ (c(i)) and EPCAM+ (c(ii)). Perforin co-expression with CD45+ (d(i)) cells at a level of 23.7% whereas only 5.2% with EPCAM+ (d(ii)) cells.