Review Question - QID 108742

A 30-year-old male sheep farmer presents to his primary care provider complaining of abdominal discomfort. He reports gradual onset of abdominal fullness, fatigue, and a 10-pound weight loss over the past few months. On examination, his abdomen is mildly distended and tender to palpation in the right upper quadrant. An ultrasound of the right upper quadrant of his abdomen reveals a large cystic structure in the liver. A peripheral smear of the patient’s blood is shown in Figure A. Which of the following molecules comprises the primary content of the granules of the cells shown?