Effect of EEPO preconditioning on lung histology. (a) Control group, and (b) Hypoxia group, showing thickening of the alveolar septa and the presence of scattered red blood cells in alveolar spaces. The low (c), medium (d), and high (e) levels of EEPO administration show that there was less damage to the alveolar septa as compared with hypoxia group. Data are representative of three animals in each group (40X, HE).