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The structures of the transgenes used in this study are depicted. The five exons of the M. spretus structural gene are represented by shaded rectangles and the M. domesticus gene by open rectangles. The firefly luciferase gene is represented as an oval. The two enhancers that lie 5 and 7 kb 3′ of the H19 gene are represented by circles. The position of the 20-bp insertion in Δ2H19 is indicated by the inverted triangle.
