1. Baleen is a keratinized structure like hair, fingernails, and hooves

2. The Beak, or rhamphotheca, is a horny skin structure of keratinized epidermis covering the upper and lower jaws

3. Assessment of Gingival Biotype and Keratinized Gingival Width of Maxillary Anterior Region in Individuals with Different Types of Malocclusion

4. The Conjunctiva is composed of a non-keratinizing stratified columnar epithelium and an underlying layer of loose connective tissue, the substantia propria

5. The lining mucosa that covers the alveolar process. It consists of a non-keratinized lining epithelium and the subjacent alveolar submucosa.

6. Acellular dermal matrix graft obtained from human skin was introduced as a substitute for autogenous connective tissue to increase the width of keratinized tissue around teeth or implants, alveolar ridge deformities, root coverage procedures, depigmentation, and also used as a barrier membrane in guided bone regeneration.