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Chromosomal organization of genes involved in matrix synthesis in B. subtilis and B. pumilus. (A) The epsA–O operon in B. subtilis (top) and B. pumilus (bottom). In dark green are indicated two genes present in B. subtilis and lacking in B. pumilus. (B) Chromosomal organization of the sinI–sinR gene pair and the tapA-sipW-tasA operon in B. subtilis (top) and B. pumilus (bottom). In red is the tapA gene, significantly smaller in B. pumilus than in B. subtilis.
