FEV1	Forced expiratory volume in one second
FVC	Forced vital capacity
MCOPD	Mild/moderate chronic obstructive pulmonary disease
SCOPD	Severe/very severe chronic obstructive pulmonary disease
CS	Control smokers with normal lung function
CNS	Control nonsmokers
Notch	Notch receptor
NICD	Notch-intracellular domain
DLL	Delta-like ligand
Jagged	Jag ligand
RBP-JK	Notch intracellular domain
HES	Hairy and enhancer of split
HEY2	Hairy/enhancer-of-split related with YRPW motif protein 2
HEYL	Hairy/enhancer-of-split related with YRPW motif-like protein