Review Question - QID 213601

A 31-year-old woman presents to her primary care physician for a 1-month history of intermittent fevers. She says that the fevers have been accompanied by fatigue as well as pain in her shoulders and knees bilaterally. Physical exam reveals a rash over her cheeks and the bridge of her nose as well as petechiae over her trunk. Her past medical history is significant for childhood asthma that has since resolved. She has not taken any medications for the last several years. Laboratory tests reveal a platelet count of 45,000/mm^3. Antibodies to which of the following would most likely also be seen in this patient?