WILMINGTON, Mass.--(BUSINESS WIRE)--Charles River Laboratories International, Inc. (NYSE: CRL - News) announced today that it has acquired privately-held Molecular Imaging Research, Inc. (d/b/a MIR Preclinical Services) for approximately $12.5 million in cash. Ann Arbor, Michigan-based MIR Preclinical Services (MIR) provides discovery services supported by extensive in vivo imaging capabilities to pharmaceutical and biotechnology clients.