 BOTHELL, Wash., May 3, 2021 PRNewswire -- BioLife Solutions , Inc. NASDAQ: BLFS BioLife or the Company, a leading developer and supplier of a portfolio of class-defining bioproduction products and services for cell and gene therapies and the broader biopharma market, today announced that it has closed the previously announced acquisition of Stirling Ultracold Stirling, a privately held manufacturer of ultra-low temperature ULT mechanical freezers. 