CMV infections complicate transplants by which of the following mechanisms?
a. Suppress normal immune function and elicit the formation of autoantibodies that are lymphocytotoxic
b. Form antibodies to CMV-infected cells that cross-react with stem cells
c. Impair mitotic division of normal hematopoietic cells and stimulate neoplastic cells to proliferate
d. Stimulate antibodies against RBCs resulting in an autoimmune hemolytic anemia
Correct Answer: A
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The neurotransmitter produced in the substantia nigra is:
a. Dopamine b. Acetylcholine c. Serotonin d. Glycine
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Increased grid ratios have which of the following effects?
ability to absorb less scatter before reaching the image receptor longer scale contrast increased density ability to absorb more scatter before reaching the image receptor
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