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Continue to ChatTracheal epithelium releases a vascular smooth muscle relaxant factor: demonstration by bioassay - https://avesis.hacettepe.edu.tr/yayin/9a654d16-3b67-4e81-b5ae-e7221490f368/tracheal-epithelium-releases-a-vascular-smooth-muscle-relaxant-factor-demonstration-by-bioassay