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. 2022 Nov;14(11):4246–4255. doi: 10.21037/jtd-22-324

Figure 1.

Figure 1

The protocol for the hydrogen gas inhalation experiment in the CSS-induced COPD-injury mouse model. NE activity in each group was pre-analyzed by using fluorescence X-ray before sacrifice. CSS, cigarette smoke solution; IP injection, intraperitoneal injection; COPD, chronic obstructive pulmonary disease. H2/O2, hydrogen-oxygen; NE, neutrophil elastase.