Q78
Single choice
A 28-year-old man presents with vague complaints of fatigue, nausea, and dyspnea. He has had occasional episodes of hemoptysis and some burning with urination. Laboratory studies reveal a mild anemia and an elevation of both blood urea nitrogen (BUN) and creatinine. Urinalysis reveals the presence of blood, protein, and red cell casts.
Antibodies against which of the following is the cause of this condition?