In the race to find the next billion-dollar drug, some of the world's largest pharmaceutical companies are starting in China. For the past three years industry giants such as Pfizer and Merck have quietly dished out early-stage research projects to scientists working in the whitewashed buildings of WuXi PharmaTech, China's largest drug R&D company. "We have a cost advantage and access to other resources, such as research animals, and a very good infrastructure. All of these things make us competitive," says Hai Mi, head of WuXi's investor relations.