PE-backed biopharmaceutical services company Quintiles has agreed to acquire VC-backed Advion BioServices. Fairmount Partners initiated the transaction and financially advised Advion. Advion is a bioanalytical laboratory providing pharmacokinetic/pharmacodynamic testing and other services. The company's current investors include Skyline Ventures, Polaris Venture Partners and Cayuga Venture Fund, among others. Quintiles was has been owned by Bain Capital, TPG Capital and 3i Group since a 2007 buyout.