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Some tumor cells may produce a surface molecule,which may defend them from T cell attack.These surface molecules are called
Constant
An unchanging value in an equation or model, or a fixed value that does not vary over time.
Abbot Labs
A multinational healthcare company known for its wide range of medical devices, diagnostics, branded generic pharmaceuticals, and nutritional products.
Stocks
Shares of ownership in a company, representing a claim on the company's assets and earnings.
Indefinitely
An unspecified period of time without a predetermined end date.
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