MED29 and infection: Finally, we used the M. robertsii natural infection model to characterize the Mediator subunit subset and found that Med7, Med27, and Med29 RNAi displayed an enhanced sensitivity to this challenge although it should be noted that mock-infected Med7 and Med29 RNAi flies also succumbed during the course of this experiment, albeit at a somewhat slower rate (Figures 6D–F).