| PDE4B | Phosphodiesterase 4B |
| NTHi | Nontypeable Haemophilus influenzae |
| GR | Glucocorticoid receptor |
| COPD | Chronic obstructive pulmonary disease |
| CF | Cystic fibrosis |
| GCs | Glucocorticoids |
| PMN | Polymorphonuclear neutrophils |
| BAL | Bronchoalveolar lavage |
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