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Maps of the two vectors used in the study. (A) pBS/U6-LoxP (active). (B) pBS/U6-ploxPneo (inactive, due to the presence of a ploxPneo gene that can be deleted by Cre recombination). The ploxPneo (1936 bp) is derived from the PGKneo 38 after adding loxP sites on both end of the PGK neo. Multiple cloning sites and their locations are indicated.
