Fig. 1From: Elevated levels of arginase activity are related to inflammation in patients with COPD exacerbationPopulation distribution in the different study groups. *Group I: Control; Group II: stable COPD; Group III: exacerbated phase COPD. The subjects in the fourth group: COPD 3 months after exacerbation (IV), are the same than the ones from group IIIBack to article page