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Development of non-producing exopolysaccharide (eps) mutant strains from Streptococcus thermophilus ST538. (A) Summary of the strategy used to the development of S. thermophilus ΔepsB by double-crossover. (B) Summary of the strategy used to the development of S. thermophilus ΔepsC by double-crossover. Primer sequences are listed in Table 1.
