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Where do you study? http://villa-saintantoine.com/pharmacy/stmap_15vkkger.html?levitra.monoket.capoten amoxicilline clavulaanzuur 500 125 alcohol They didn't just find out the birds' PCB loads, though. They also found that the songs varied depending on how many PCBs the birds had been exposed to. It turns out that black-capped chickadees showed a greater variability in song with a change in the "glissando" ratio of the first note of their two-note song, "fee-bee, fee-bee." Song sparrows also showed a change; they created high performance trills that could very well be the result of other types of PCB molecules that are less toxic.