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Review Question - QID 214584

MHC Deficiency MHC Class II Deficiency (Bare Lymphocyte Syndrome Type II) Laboratory findings QID: 214584 (M1.OMB.1)
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QID 214584 (Type "214584" in App Search)
A 2-year-old boy is brought to the emergency department with a 1-day history of high fever, productive cough, and difficulty breathing. His past medical history is significant for multiple episodes of pneumonia as well as soft tissue infections since birth. He is admitted for treatment of the infection as well as an immunological workup. Flow cytometry reveals a normal number of CD2 positive and CD19 positive cells with normal morphology. Further analysis shows an elevated CD8+ to CD4+ cell ratio. The level of blood gamma globulins is also decreased. Which of the following proteins is most likely defective in this patient?
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