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Biosci Biotechnol Biochem. 2002 Sep;66(9):1994-6.

Frequency of the insertion sequence IS4Bsu1 among Bacillus subtilis strains isolated from fermented soybean foods in Southeast Asia.

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Division of Applied Microbiology, National Food Research Institute, Tsukuba, Ibaraki, Japan.


Among 45 Bacillus subtilis strains isolated from non-salted types of fermented soybeans produced in several Southeast Asian countries, 20 had the insertion sequence IS4Bsu1 in the chromosome. In contrast, none of 49 B. subtilis strains of non-food origin contained IS4Bsu1. Frequent occurrence of this mobile DNA element in the soybean-fermenting B. subtilis would reflect the fact that few strains flourish on soybeans and thereby contribute to soybean fermentation.

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