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Definition of Basement membrane

Basement membrane: A thin membrane upon which is posed a single layer of cells. The basement membrane is made up of proteins held together by type IV collagen. The epithelial cells are anchored with hemidesmosome to the basement membrane. The end result resembles a layer of tiles attached to a thin sheet.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=39157
Last Editorial Review: 9/16/2004

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