The effect of hyperoxia and N-acetylcysteine on the lungs of neonatal manganese superoxide dismutase knockout mice: Tiina M. Asikainen1, Ting-Ting Huang2, Hannu Sariola3, Anna-Liisa Levonen1, Elaine Carlson2, Risto Lapatto1, Charles J. Epstein2, Kari O. Raivio1. 1Hospital for Children and Adolescents, Univ. of Helsinki, Helsinki, Finland; 2Department of Pediatrics, Univ. of California, San Francisco, USA; 3Institute of Biotechnology, Univ. of Helsinki, Helsinki, Finland