Figure 1.

Immunohistochemical staining showing vasoactive intestinal peptide positivity. A: The vasoactive intestinal peptide mainly expressed in cytoplasm [hematoxylin-eosin (HE) × 4]; B: The cytoplasm was dyed brown (HE × 100).

Immunohistochemical staining showing vasoactive intestinal peptide positivity. A: The vasoactive intestinal peptide mainly expressed in cytoplasm [hematoxylin-eosin (HE) × 4]; B: The cytoplasm was dyed brown (HE × 100).