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SD repeat-encoding region of clfB in S. aureus strain NCTC 8325. Both DNA and amino acid sequences of the SD repeat-encoding region and immediate flanking regions are shown. The underlined nucleotides are the primers used to amplify the repeat region. Nucleotides/amino acids in bold type show the first and last complete repeats, which frame the repeat region portion (composed, in this example, of 36 direct 18-bp repeats) used for clfB typing.
