The proteomic data from 2-D gel electrophoresis of multiple…

The proteomic data from 2-D gel electrophoresis of multiple strains of azithromycin treated/untreated strains of P. aeruginosa were analyzed further using principal component analysis.  The results are shown below. Figure 3. Principle component analysis of proteomic data.  Black symbols represent untreated P. aeruginosa strains, open (white) symbols represent P. aeruginosa strains treated with azithromycin. What do you observe? And what can you conclude from your observations?