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A 43-year-old patient with a history of esophageal cancer presents with sudden onset slurred speech. On CT scan, she is found to have an acute intraparenchymal hemorrhage, likely from a metastasis, with interventricular extension. Due to concern for hydrocephalus, an external ventricular drain is placed in order to control the intracerebral pressure. Two weeks later, she undergoes a lumbar puncture due to altered mental status, and the gram stain of the fluid is depicted in Figure A. Which part of the bacteria is responsible for the blue color on the stain?
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