LifeSpan Biosciences, headquartered in Seattle, Washington, is a privately held company and a leader in the emerging fields of molecular pathology and tissue proteomics. By localizing gene products (proteins and messenger RNAs) to individual cells within normal and diseased tissues, LifeSpan studies the changes that occur in the human body as a consequence of disease. LifeSpan is currently applying its technology and expertise to the production of a comprehensive atlas on the expression of each of the 30,000 human genes in both normal and diseased tissues.