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A schematic illustration of BAC constructs. A & B. The wild type forms of human and mouse BAC reporters, H(wt) and M(wt), respectively. C, D, & E. Three chimeric BACs. Genomic positions of the CRR9, TERT, and Xtrp2 loci are shown. Arrows indicate the directions of transcription. Black and grey bars represent human and mouse sequences, respectively. Diagrams are not drawn to scale and lengths of exchanged sequences are indicated in kilobases.
