Cell-free protein synthesis (CFPS) platforms can be used for rapid and flexible expression of proteins. The use of CFPS platforms from mammalian, specifically Chinese hamster ovary (CHO) cells, offers the possibility of a rapid prototyping platform for recombinant protein production with the capabilities of post-translational modifications. In this chapter, we discuss a refined CFPS system based on CHO cells, including: extract preparation, reaction mix composition, and accessory protein supplementation to enhance expression.
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