21. HPV infects epithelial cells in the anogenital tract and oral cavity. 22. Samples of epithelial cells can be collected onto microscope slides for further analysis. 23. Trichocytes are the specialized epithelial cells from which hair and nail are composed. 24. Drugs are metabolized by drug-specific metabolizing enzymes in the epithelial cells . 25. These are components of tight junctions of the epithelial cell membrane. 26. :: All vertebrates have a BBB that consists of epithelial cells . 27. The complex is also essential for the biogenesis of epithelial cell surface polarity. 28. Fibroblasts also secrete growth factors that attract epithelial cells to the wound site. 29. Vertebrate epithelial cells which have high concentrations of the protein crystallin. 30. This gene may play a role in embryonic development and epithelial cell differentiation.
