CSF3 and acute respiratory distress syndrome: Healthy piglets were randomized into four groups (n = 6): Control (Con; mechanical ventilation only); ARDS (established by oleic acid infusion and mechanical ventilation); ARDS plus granulocyte-colony stimulating factor (G-CSF; 10 μg/kg/d subcutaneously); ARDS plus NO inhalation (iNO; 10 ppm).