Key

Adv, adventitia AT, adipose tissue BV, blood vessel

CT, connective tissue, lamina propria Ep, epithelium

Gl, eland or gland-like structure

L, lymphocytes MC, mucous cells Muc, mucosa Mus, muscularis PC, plasma cells

SM, smooth muscle arrows: Fig. 1, recess in luminal surface;

Fig. 3, intercellular spaces asterisks (Fig. 1), gland or gland-like structure

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