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So evading the immune system, that's the key here. And so natural killer and case cell, they're vital. They're a vital part of the body that builds an immune response for destroying cancers and the virus infected cell. And they eliminate these threats by a process called degranulation, which releases a protein known as a perforin. And this protein punctures, actually punctures the membrane of a target cell leading to a death. And to make these cells for treatment, doctors collect blood samples from the patient. The cells are then extracted, the in-state cells are extracted and engineered to extract a specialized protein called the...