A 26-year-old intravenous heroin user presents with fever, night sweats, and progressive dyspnea. Blood cultures grow Staphylococcus aureus. Transoesophageal echocardiography shows a large mobile vegetation on the tricuspid valve with severe regurgitation. The excised valve at pathology shows the structure marked **A** — bulky, friable vegetations on the tricuspid leaflets. Which of the following best describes the microscopic composition of these vegetations?
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