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Definition of Endostatin

Endostatin: A fragment of a protein, collagen 18, that is found in all blood vessels. Endostatin is normally secreted by blood vessels in response to tumors. Endostatin appears to halt the process of developing new blood vessels (angiogenesis), which is necessary to tumor development.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=6523
Last Editorial Review: 3/19/2012

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