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| Modern Genetic Analysis Chapter 12. Genomics Structural Genomics Figure 12-24. Structure of a bacterial artificial chromosome (BAC), used for cloning large fragments of donor DNA. CMR is a selectable marker for chloramphenicol resistance. oriS, repE, parA, and parB are F genes for replication and regulation of copy number. cosN is the cos site from l phage. HindIII and BamHI are cloning sites at which foreign DNA is inserted. The two promoters are for transcribing the inserted fragment. The NotI sites are used for cutting out the inserted fragment.

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