XDx, Inc. operates as a molecular diagnostics company which focuses on discovering, developing, and commercializing noninvasive gene expression-based tests for the monitoring of transplant rejection and autoimmune diseases. It focuses on immune-mediated conditions that require life-long monitoring and testing to avoid or to respond to serious complications. The company offers the AlloMap HTx molecular expression test to monitor heart transplant recipients for acute cellular rejection. It is also developing a gene expression-based test, the AlloMap LTx molecular expression test, to monitor for acute cellular rejection in lung transplant recipients. In addition, the company engages in designing a clinical study to create a gene expression test to monitor for disease flares in patients affected by systemic lupus erythematosus. The company was formerly known as Expression Diagnostics, Inc. and changed its name in July 2002. The company is was incorporated in 1998 and is based in Brisbane, California.

he UK-based company makes non-invasive diagnostic tests, which are marketed under the foodSCAN and First Step Food Intolerance Test brand name, used to determine which foods a patient may be allergic to. It also provides customers with its LiverCheck brand tests, which are used to test the health of your liver, and Body ID Plan, which offers a diet plan from an analysis of a blood sample. Founded in 1982, YORKTEST Laboratories Ltd. makes its home health tests available for sale on its Web site.

Zila, Inc., a diagnostic company, engages in the prevention, detection, and treatment of oral cancer and periodontal disease. It manufactures and markets ViziLite Plus with TBlue, its flagship product, for early detection of oral abnormalities that could lead to cancer. In addition, the company designs, manufactures, and markets a suite of proprietary products directly to dental professionals for periodontal disease, including the Rotadent Professional Powered Brush, the Pro-Select Platinum ultrasonic scaler, and a portfolio of oral pharmaceutical products for in-office and home-care use. Further, it had certain technology rights, and the United States and foreign patent rights related to the OraTest, an oral cancer diagnostic product. Zila, Inc. markets and sells its products in the United States and Canada through direct sales force, and internationally through third party distributors. The company was founded in 1980 and is headquartered in Phoenix, Arizona. As of September 18, 2009, Zila, Inc. operates as a subsidiary of Tolmar, Inc.

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