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  1. Aging is a complex process, which was once considered inevitable and irreversible. However, studies in mice, using heterochronic parabiosis, argue that some effects of aging may, in fact, be reversible. In this model the vascular system of a young mouse is connected to the vascular system of an aged mouse. These studies have been particularly informative about the role that aging has in the response to injury. In 2005 Conboy et al. (1) found that delays in the regenerative potential of muscle stem (satellite) cells and liver hepatocytes in aged mice could be reversed when these animals wer
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