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The bronchial mucosal retention of microspheres at different time points observed under the bronchoscope.
Notes: After injecting the drug into the bronchial mucosa through a bronchoscope, the bronchial mucosa and drug retention were observed at different time points: (A) Before drug administration; (B) 0 hour after drug administration; (C) 3 days after drug administration; (D) 10 days after drug administration; (E) 20 days after drug administration.
