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        Proteoglycans: Gene Cloning

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        664
        Aggrecan is a large proteoglycan that plays roles in numerous tissues during vertebrate development and adult life. The 6,327-nt chick aggrecan coding sequence had been determined from overlapping clones, but a full-length cDNA, needed for use in transgenic expression studies, had not been constructed. The strategy employed to do so was to generate two overlapping cDNA subfragments that shared a unique restriction site in the overlap and then join them at that site. These subfragments were obtained and cloned into the TOPO-TA vector pCR2.1. Digestion of the two constructs with the shared-site enzyme, XbaI, produced vector/5′-cDNA and 3′-cDNA fragments with XbaI-ends; these were ligated to produce the final full-length cDNA.
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