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Proviral structures of Akv and Akv1- 99. Akv contains a 99-bp perfect tandem repeat in the U3 enhancer region, while Akv1- 99 contains only one copy of the 99-bp sequence. Shown is the 99-bp sequence with demarcation of NF-1 sites 1 and 2 and the Akv core and E-box sequences.
