4787
Patients with HIV infections often show elevated circulating levels of cortisol , suggesting some misfunction in the regulatory systems that maintain the levels of this critical hormone.
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Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
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