Review Question - QID 213598

A 17-year-old girl presents to the emergency department with a 1-hour history of chest pain. She says that the pain started while she was in gym class and that it feels like a squeezing that starts in the center of her chest and proceeds down her left arm. She says that she has also been feeling short of breath since the chest pain started. She has no past medical history but says that she recently started smoking with friends after school. Family history reveals that her father died from a myocardial infarction when he was 41 years of age. Laboratory testing shows normal levels of chylomicrons but dramatically increased levels of low-density lipoproteins. This patient most likely has a deficiency in which of the following proteins?