Fill in the blank. The immunosuppressant cyclophosphamide is part of a family of compounds that were originally developed for warfare; mustard gas, which was used in World War I and had devastating effects, is an example. Although it is less toxic, ____________ is another drug that is cytotoxic and must be administered in low doses or in tandem with other drugs.

MCQs on the immune system, including innate and adaptive immunity, the cells involved in each of process of the immune system and their role in the immune response, and how antibodies are used to confer immunity for future potential exposures.