ST. LOUIS, September 17, 2018-- Thompson Street Capital Partners (TSCP), a private equity firm based in St. Louis, has partnered with management to acquire Seattle-based LifeSpan Biosciences, Inc., (LSBio). The Company is a founder-led developer and distributer of antibodies and related reagents primarily to the academic and pharmaceutical research markets via its e-commerce platform. Terms of the transaction were not disclosed. LSBio (www.lsbio.com), originally founded as an immunohistochemistry (IHC) services provider in 1995, has evolved to offer a broad range of antibodies, kits, proteins and other biological reagents. The Company’s offerings include proprietary, value-added and third-party products.