In this second of two new volumes covering mitochondria, methods developed to assess the number and function of nuclear-encoded proteins in the mitochondrion are presented. Chapters focus on the regulation of mitochondrial function and mitochondrial diseases, with a section emphasizing the mitochondrial defects associated with type 2 diabetes. The critically acclaimed laboratory standard for 40 years, Methods in Enzymology is one of the most highly respected publications in the field of biochemistry. With more than 450 volumes published, each volume presents material that is relevant in today's labs, truly an essential publication for researchers in all fields of life sciences.