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Key points. 1  Intestinal epithelial cells (IECs) provide a physical and biochemical barrier that segregates host tissue and commensal bacteria to maintain intestinal homeostasis. 2  Secretory IECs support this function through the secretion of mucins and antimicrobial peptides.ey points. 1  Intestinal epithelial cells (IECs) provide a physical and biochemical barrier that segregates host tissue and commensal bacteria to maintain intestinal homeostasis. 2  Secretory IECs support this function through the secretion of mucins and antimicrobial peptides.
Squamous epithelial cells form the inner lining of urinary tract. These cells collect along the skin of penis and vagina. Whenever you pass out urine; these cells, present along the skin, also flow along.