Hi Rachel! I can't help you, but I've been told that (Prof?) Dr. Frank Collins probably could. His address is: Mycobacteriology Lab. CBER, FDA, 8800 Rockville Pike Bethesda, MD 20892. Tel: 301 496 5045 Fax: 301 402 2776 Good Luck! Paul. Paul M. Donohoe Leprosy Dept., NIMR, The Ridgeway, Mill Hill, London NW7 1AA. PhD Student