- Flt3 ligand-treated neonatal mice have increased innate immunity against intracellular pathogens and efficiently control virus infections. Vollstedt, S., Franchini, M., Hefti, H.P., Odermatt, B., O'Keeffe, M., Alber, G., Glanzmann, B., Riesen, M., Ackermann, M., Suter, M. J. Exp. Med. (2003)