Mylan Laboratories said yesterday it plans to buy a majority stake in Indian drug ingredient company Matrix Laboratories. Mylan hopes to purchase up to 71.5% of Matrix for $736 million.G & S Research, a global market research firm specializing in the pharmaceutical and health science industries, has established a new division named G & S Discovery that will focus exclusively on the life science research supply marketplace. Mark Walker recently joined G & S Research as a vice president to lead the development of G & S Discovery.  Before this, Walker was director of US sales with Invitrogen Corporation—one of the top five manufacturers of life science research products.