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A previously healthy 36-year-old man comes to the physician for a yellow discoloration of his skin and dark-colored urine for 2 weeks. He does not drink any alcohol. Physical examination shows jaundice. Abdominal and neurologic examinations show no abnormalities. Serum studies show increased levels of alanine aminotransferase (ALT) and aspartate aminotransferase (AST). A liver biopsy is performed and a photomicrograph after periodic acid-Schiff-staining is shown. Which of the following is the most likely additional finding in this patient?

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