Code for the following paper:
Wang G, Yang E, Mandhan I, Brinkmeyer-Langford CL, Cai JJ. Population-level expression variability of mitochondrial DNA-encoded genes in humans. Eur J Hum Genet. 2014 Sep;22(9):1093-9. doi: 10.1038/ejhg.2013.293. PubMed PMID: 24398800; PubMed Central PMCID: PMC4135407.