Creative BioMart provides quality recombinant proteins, diagnostic antibodies and antigens, diagnostic enzymes and pharmaceutical enzymes to the research community of biology, clinical research, molecular diagnostics and biopharmaceutical drug development.-20℃. The protein is stable at 4℃ for at least 2 weeks and at 25℃ for at least several hours. After initial defrost, aliquot product into individual tubes and refreeze at -20℃. Avoid repeated freeze/defrost cycles.http://www.creativebiomart.net/description_4650_12.htm