This article is one of an ‘Expert Tips’ series from Waters, and it has useful recommendations for deuterium labelling of peptides for protein structural dynamics and conformational changes. Deuterium oxide is used to label proteins for specific times and analysis performed by mass spectroscopy with appropriate software. This is an example of the applications of deuterium oxide in pharmaceutical and biological research. This article written by Dr. Joomi Ahn has been published in Genetic Engineering & Biotechnology News. For more up to date information on deuterium oxide for sale click here.