The group's principal activities are to develop and perform esoteric clinical laboratory tests, which are called assays. The group offers more than 3,500 clinical esoteric assays, many of which have been developed through the group's internal research and development efforts. Esoteric assays are complex, comprehensive or unique tests used to diagnose, evaluate and monitor patients. These assays are performed on sophisticated instruments by highly skilled personnel and are offered by a limited number of clinical laboratories. The major customers of the group are hospitals, independent clinical laboratories and physicians. Genotypr tm, analyzer (R), datapassport(R) and data passportmd tm, outreach express(TM) and taro(TM) are trademarks of the group.