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The molecular weight of vincristine, a pharmaceutical drug, is 923.04. It is supplied in 1 mg per vial. You want to treat your culture cells with a final concentration of 5 ηM vincristine and will need 10mL of cells for your experiment. You only want to add 2µL of vincristine solution to your cells. What concentration should you make your stock solution of vincristine in order to make this 2uL addition?

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