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Sequence of the SSTR16 region in the Schu S4 strain. The 16-bp direct repeats are marked by arrows and are present in 18 copies. Primer positions are shaded. The direct repeats are located inside an IS element; terminal inverted repeats of the IS element are shown in boldface. Thirty-five copies of the IS elements have been identified in the current assembly of the Schu S4 genome, each containing 2 to 18 copies of the 16-bp tandem repeat.
