TLR4 and neoplasm: To determine whether the immune response is triggered by factors in the hemolymph of the tumor host, we extracted body fluid from both control and host flies and injected them into the visceral cavity of DD1 flies, which carry two AMP reporters: Drosomycin-GFP (Drs-GFP) for the Toll pathway and Diptericin A -LacZ (DptA-LacZ) for the Imd pathway (Manfruelli et al, 1999).