- Therapeutic effectiveness and safety of outdated human red blood cells rejuvenated to improve oxygen transport function, frozen for about 1.5 years at 80 C, washed, and stored at 4 C for 24 hours prior to rapid infusion. Valeri, C.R., Zaroulis, C.G., Vecchione, J.J., Valeri, D.A., Anastasi, J., Pivacek, L.E., Emerson, C.P. Transfusion (1980)