However, Methanosarcina barkeri is exceptional in possessing a superoxide dismutase (SOD) enzyme, and may survive longer than the others in the presence of O2.
Međutim, Methanosarcina barkeri je izuzetak, jer poseduje enzim superoksidnu dismutazu (SOD), i stoga može da opstane duže od drugih vrsta u prisustvu O2.