Destroys superoxide anion radicals which are normally produced within the cells and which are toxic to biological systems. Superoxide dismutase [Mn] MSYSLPSLPYAYDALEPHFDKQTMEIHHTKHHQTYVNNANTVLESFPELAKFSVEDLIKDLDKVPAEKRTFMRNNAGGHANHSLFWKGLKLGTTLTGDLKAAIERDFGSVDSFKEKFEAAAATRFGSGWAWLVLKDDGKLAVVSTANQDSPLMGEAVSGASGFPIVGLDVWEHAYYLKFQNRRPDYIKAFWNVVNWDEAAARFAQAK 207 SODM_YEREN sodA