Elimination of lys-1 expression by RNAi abrogates increased resistance to infection by S. marcescens. Representative time-courses of the survival of control worms (IG66; squares), or worms containing a lys-1::GFP transgene (IG36; circles) pretreated with lys-1 RNAi, in the presence of S. marcescens strains Db1140. 50 worms were used for each test.