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Review Question - QID 212704

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QID 212704 (Type "212704" in App Search)
An 8-year-old boy is brought to the emergency department 15 minutes after he started experiencing difficulty breathing. He has experienced similar episodes in the last 2 months; however, those resolved within a few minutes. He has no past medical history and sees a pediatrician regularly. On presentation, his respirations are 28/min, and he has a productive cough. Pulmonary auscultation reveals diffuse wheezing bilaterally in all lung fields, and a sputum sample is shown in Figure A. Which of the following molecules is most likely related to the pathogenesis of this patient's disorder?
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