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Distribution of [18F]-ET-1 in the lung. Ex vivo tissue sections for (a) control and (b) BQ788 pretreated rat confirming blockade of nonvascular ETB receptors. Scale bar=5 mm. Transverse microPET images of the lungs revealing a more localised distribution in the BQ788 pretreated rat (d) compared to control (c). Scale bar=10 mm.
