A 32-year-old female presents with a "racing heartbeat" that is worrying her. She's also shaky and always hot. On further questioning, she mentions a 20-lb weight loss in the last several months (even though she was not dieting). On physical examination, the patient is an anxious-appearing, thin female with mild, bilateral exophthalmos (both eyeballs protrude anteriorly from the orbital sockets). What would you expect to see on a biopsy from this patient's thyroid?
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