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Development of non-producing exopolysaccharide (eps) mutant strains from Streptococcus thermophilus ST538. (A) Confirmation of the deletion of 351-bp in the epsB gene by PCR analysis. (B) Confirmation of the deletion of 351-bp in the epsB gene by PCR analysis. Wild type (WT) and ΔepsB and ΔepsC mutants from S. thermophilus ST538 were compared.
