Figure 4.

The LSmean (±S.E.M.) Hif1-α mRNA relative expression in bronchoalveolar lavage cells of unchallenged and challenged healthy and recurrent airway obstruction-affected horses. The relative expression is normalized to the geometric mean of reference genes. This experiment is representative of one protocol performed with five heaves-affected horses and four healthy horses (*P < 0.05;**P < 0.01; NS = no significant; RAO: recurrent airway obstruction).