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Bacterial strains and plasmids used.
| Phenotypic characters | References | ||
| Strain | Streptococcus thermophilus ST538 | EPS producing strain | This study |
| Plasmids | pG+host6 | Thermos-sensitive replicon1 | Maguin et al., 1996 |
| pG+epsB | epsB deleted fragment of pG+host6 | This study | |
| pG+epsC | epsC deleted fragment of pG+host6 | This study |
1Erthromycin-resistant.
