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Survival of S. thermophilus strains under oxidative stress. Effect of superoxide dismutase (SOD) expression on cell growth of recombinant strains (one to four SOD copy numbers) under 1 mmol/L (A) and 2.5 mmol/L H2O2 treatment (B). Symbols: 
, Control; 
, S-3/pKLH167; 
, S-3/pKLH337; 
, pKLH341; and 
, pKLH344. Viable cells under 3.5 mmol/L H2O2 treatment under anaerobic conditions (C). 
, pKLH167; 
, pKLH337; 
, pKLH341; 
, pKLH344; and 
, Control. *P < 0.05, **P < 0.01.
