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  1. Epithelium: What It Is, Function & Types - Cleveland Clinic

  2. Epithelial Cells: What Are They? - WebMD

  3. Epithelium - Wikipedia

  4. Epithelial Cells - The Definitive Guide - Biology Dictionary

  5. Histology, Epithelial Cell - StatPearls - NCBI Bookshelf

  6. Epithelial Cells: Definition, Function, Types & Examples

  7. Epithelial Cells - Ask A Biologist

  8. Epithelial tissue: definition, functions & examples - Kenhub

  9. Epithelium: MedlinePlus Medical Encyclopedia

  10. Epithelium | Anatomy, Structure & Function | Britannica