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The process of separation and purification of expressed protein before marketing is called:

1. Downstream processing
2. Bioprocessing
3. Postproduction processing
4. Upstream processing

Correct answer: Downstream processing

Solution

Downstream processing refers to all operations performed after production to recover the desired biomolecule, including separation, purification, and formulation. Since the protein is already expressed and now needs to be purified before marketing, this is downstream processing.

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