Rete pegs
Encyclopedia
Rete pegs are the epithelial extensions that project into the underlying connective tissue.

In the epithelium of the mouth, the attached gingiva
Gingiva
The gingiva , or gums, consists of the mucosal tissue that lies over the mandible and maxilla inside the mouth.-General description:...

 exhibit rete pegs, while the sulcular
Sulcular epithelium
The sulcular epithelium is that epithelium which lines the gingival sulcus. It is apically bounded by the junctional epithelium and meets the epithelium of the oral cavity at the height of the free gingival margin. The sulcular epithelium is nonkeratinized....

 and junctional epithelia
Junctional epithelium
The junctional epithelium is that epithelium which lies at, and in health also defines, the base of the gingival sulcus. It attaches to the surface of the tooth with hemidesmosomes and is, on average, roughly 1 mm in width, constituting about one half of the biologic width.The junctional...

do not.

Downward thickening of the epidermis between the dermal papillae.
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