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Drug quantity (μg) as measured by HPLC for both (a) BPQ and (b) PQ following environmental exposure. Increasing shades of gray from left to right indicate time 0 control, followed by increasing exposures to 37C (5, 10, 20, and 40 exposures), UV light (2, 6, 12, and 24 h), ambient air (7, 14, 30, and 50 days) and combination exposures. (see legend to establish relation between shades of gray and exposure treatments).
