HERCULES, Calif., July 23, 2008 – Bio-Rad Laboratories, Inc. (AMEX: BIO and BIOb), a multinational manufacturer and distributor of life science research and clinical diagnostic products, announced today the availability of a new technical note (tech note 5656A), which describes the purification of tag-free recombinant proteins using the Profinity eXact™ fusion-tag system.