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Collateral arteries create artery-artery anastomoses that could serve as natural bypasses that in the heart could relieve the various complications of ischemia heart disease. Recent work using animal models have begun to reveal details of how coronary collateral arteries form. Mouse genetics has been used to study the cellular and molecular mechanisms of collateral artery development. Collateral arteries are not pre-existing in the mouse heart, and only form in response to injury. Myocardial infarction creates tissue hypoxia that trigge