Richard Cartun gave out a fabulous source, ViroStat out of Portland Maine. Just go to ViroStat website and shop - Gayle Callis MT,HT,HTL(ASCP) Research Histopathology Supervisor Veterinary Molecular Biology Montana State University - Bozeman PO Box 173610 Bozeman MT 59717-3610 406 994-6367 406 994-4303 (FAX)