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A 20-year-old man comes to the physician's office for a scheduled health maintenance examination. His father died of a myocardial infarction at age 55 years. Physical examination shows a tendon xanthoma on the elbow. His serum total cholesterol concentration is 360 mg/dL. A mutation is most likely to be found in which of the following genes?

(A) apoA2
(B) apoC2
(C) apoε4
(D) LDL receptor
(E) VLDL receptor
 

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This is Hypercholestrolemia most likely IIa, and the most likely complication is Heart attacks which his dad died from. Plus extensor tendon xanthomas are only in cholesterol associated hyperlipidemias.
 
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