LGALS4 and infection: However, infection of sid-deficient flies that express the sid RNAi construct (Ubiquitin-GAL4;UAS-dicer;UAS-sid RNAi) resulted in a significant ∼50% and ∼70% reduction of viability when infected with E. coli or M. luteus bacteria, respectively as early as 24 h post infection (Figure 8B and D).