Gen-Probe Incorporated (Gen-Probe) is engaged in the development, manufacture and marketing of nucleic acid probe-based products used for the clinical diagnosis of human diseases and for screening donated human blood. It also develops and manufactures nucleic acid probe-based products for the detection of harmful organisms in the environment and in industrial processes. The Company markets and sells its clinical diagnostic products in the United States directly and outside the United States primarily through distributors, as well as through its direct sales force. It also markets and sells its other products through collaborative partners. Gen-Probe generates revenues primarily from sales of clinical diagnostic and blood screening assays. Its clinical diagnostic products are marketed to clinical laboratories, public health institutions and hospitals in the United States, Canada and certain countries in Europe. In April 2009, Gen-Probe acquired Tepnel Life Sciences PLC.