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Drosophila
activates a robust defense response to gram-negative bacteria through the Immune deficiency (Imd) pathway. Imd signaling proceeds through c-Jun N-terminal Kinase (JNK), NF-kB and caspase modules. The individual signaling modules act in a highly coordinated manner to yield a stereotypical response to infection. While considerable attention has focused on NF-kB-mediated antimicrobial activities, more recent studies have highlighted the involvement of JNK signaling in the Imd pathway response. JNK signaling occurs in a transitory burst and drives the expression of a number of gene products through the AP-1 transcription factor. In this report, we describe a simple method for the quantification of JNK activation by Western blot analysis or directly in tissue culture plates.