USMLE Step 1 Quiz
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IMMUNOLOGY
Question 1 of 20
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A 6-month-old infant presents with severe oral candidiasis and failure to thrive. Laboratory evaluation reveals a complete absence of circulating T-cells and B-cells. However, the number of natural killer (NK) cells is normal.
The function of the defective protein in this patient is essential for which of the following fundamental immunologic processes?
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