Positve control tissue options (tissue types used may vary with availability):
Tonsil tissue:
(+) Human tonsil or appendix
(-) Liver or cervix (tissue type may vary with availability)
More than 20% of germinal centre B-cells should show a weak to moderate nuclear staining reaction, while less than 10% of the mantle zone B-cells should be demonstrated in tonsil.
Colon cancer tissue:
(+) Colon cancer
(-) Liver or cervix  (tissue type may vary with availability)
Appendix tissue: Dispersed epithelial cells in the basal parts of the crypts should show a weak to moderate nuclear staining reaction, while the luminal epithelial cells are negative.
 
Pack size: 
25 slide pack(24 unstained +1 stained),
100 slide pack(98 unstained +2 stained, 1st &100th sections stained)