A 15-year-old boy presents with recurrent colicky abdominal pain, melena, and two prior hospital admissions for intussusception. On examination, he has striking dark brown to blue-black melanotic macules on the lips, buccal mucosa, and fingertips. Video capsule endoscopy reveals multiple large, lobulated, pedunculated polyps throughout the jejunum and proximal ileum. Histology of resected polyps shows the characteristic architecture marked **B** in the diagram. Which of the following best describes the pathological hallmark of the structure marked **B**?
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