FAQ: I accidentally left my Protein Standard out at room temperature for a number of days. Is it still okay to use?

Stability testing has shown that NEB’s Protein Standards will remain stable for up to 2 weeks at room temperature (25°C) and for up to 1 year at 4°C. We do not, however, recommend storing your Protein Standard at anything other than optimal storage temperature, which is -20°C, for a guaranteed shelf life of 2 years.