Cambridge, 3 October 2007 Lab21, a leading provider of health and environmental diagnostics, is delighted to have secured an exclusive partnership with Monogram Biosciences Inc. to provide access to the HIV Trofile™ assay in the UK. The agreement will see Lab21 provide operations and logistic services for the new assay which is a companion diagnostic used in the patient selection process for Pfizer’s new antiretroviral treatment Celsentri™.