Xiao L, Kim J, Lim M, Dai B, Yang L, Reed S, Baltimore D, and Wang P. A TLR4 agonist synergizes with dendritic cell-directed lentiviral vectors for inducing antigen-specific immune responses. Vaccine. 2012, 30(15): 2570-2581. doi: 10.1016/j.vaccine.2012.01.074. [Vaccine  PDF]