Collected from 8-12 week-old sexually mature mice (Non-Swiss Albino) that are free of common parasites.

Tested negative for Lymphocytic Choriomeningitis Fever Virus, Ectromelia Virus (mousepox) and Epizootic Hemorrhagic virus. Serum from other strains of mice is available by request. Sterility tested. Sterile-filtered to 0.2 micron absolute. Hemoglobin levels <35 mg/dl. Physiochemical constituents measured to ensure lot-to-lot consistency.