Figure 3: Up-regulation of protein kinase A signaling in the lungs of PQ-treated rats. Proteins in red were the over-represented, while proteins in green were the underrepresented. Proteins in half green and half red were detected in both the PQ-free and PQ-treated rat lungs. Proteins in white and grey indicated that the proteins are related to the signaling, but were not detected. In addition, proteins in grey were hubs.