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Streptococcus thermophilus PB18 can grow between 20 and 52C and is resistant to various stresses such as heat, acidic or cold shock. During cold shock, a protein of 21.5 kDa was previously shown to be induced in S. thermophilus. In addition to its cold-shock induction, 2D-PAGE revealed that the 21.5-kDa protein was also expressed during the stationary phase of growth. The recent access to the genome...