Expression of genes encoding α-actin (ACTA2), myosin heavy chain (MYH11), calponin-1 (CNN1), type I collagen (COL1A1) and galectin-3 (LGALS3) in VSMCs isolated from pulmonary arteries of normoxic and hypoxic rats (passage 2) and cultivated for 6 days in a normoxic atmosphere and in a hypoxic atmosphere, respectively. Mean + SD, n = 5. Student’s t-test, p ≤ 0.05. * significant difference compared to normoxic cells.