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تخمدان همستر چینی
The basic vector contains features for propagation and selection in E. coli and a multiple cloning site for insertion of interchangeable modules that are cho sen for a particular yeast host, including a sequence for vector integration into the fungal genome, a suitable origin of replication, a promoter to drive expression of the heterologous gene, and selectable markers to complement a range of nutritional auxotrophies or to confer resistance to antifungal com pounds, such as hygromycin B (Table 3.12).
Chinese hamster ovary (CHO) cells are most commonly used because they produce proteins with humanlike gly cans and have been adapted for growth in highdensity suspension cul tures in serumfree medium, which not only reduces costs but also facilitates purification of the target protein and reduces the risk of contamination with animalderived material.
CHO cells were transfected with plasmids containing a regulatable MDM2 gene and cultured under conditions that mimicked the late stages of cell culture and in nutrientlimited medium.
Under lowoxygen conditions, many cells, including CHO cells, secrete the acidic waste product lactate as they strug gle to obtain energy from glucose.
CHO cells.
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