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Vascular endothelial growth factor (VEGF) pulmonary levels during foetal development expressed in ng of VEGF/mg of protein (mean ± SD). Sustained increase of VEGF in the lungs from vitamin A treated foetuses. In the last gestational day, VEGF levels are already similar to the ones observed in the neonate lung. On the opposite, control foetuses display reduced VEGF levels during the perinatal period. **P= 0.04 (vs. control); *P < 0.0001 (vs. control).
