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un levain lactique naturel correctement préparé est normalement composé d'un mélange indéfini de souches de streptococcus thermophilus, qui peuvent être accompagnées d'entérocoques et de bactéries lactiques thermoduriques.
a properly prepared natural starter is usually made up of an undefined mixture of strains of streptococcus thermophilus, which may be accompanied by enterococci and heat-resistant lactic bacteria.