The dizzying range includes clotting agents such as thrombin or Factor VIII for haemophiliacs, more than 100 hormones, reference allergens such as bee venom, ragweed and birch pollen, biotherapeutics such as interferon and TNF alpha used for rheumatoid arthritis, reagents used in work on HIV/Aids, resources for work on CJD and also bacterial and viral vaccines, many of which are live.