2. Materials and methods
Ricin used by Agence Française de Sécurité Sanitaire des Produits de Santé (AFSSAPS)
was the generous gift of B. Beaumelle, Ph.D. of Montpellier University. The ricin displayed an intravenous LD50 of 5.88 μg/kg bodyweight with six-week old female BALB/c mice (personal communication, A. El-Zaouk and D. Sauvaire, AFSSAPS).