Figure 4.
Immunohistochemical staining: positive staining. A: Cytokeratin (CK) 7 (× 100); B: Neural cell adhesion molecule (CD56) (× 200); C: Chromogranin A (× 200); D: Synaptophysin (× 200); E: Insulin (× 200); F: Mucin 1 (MUC1).
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