title: Mitochondrial DNA
context: Mitochondrial DNA was discovered in the 1960s by Margit M. K. Nass and Sylvan Nass by electron microscopy as DNase-sensitive threads inside mitochondria,[97] and by Ellen Haslbrunner, Hans Tuppy and Gottfried Schatz by biochemical assays on highly purified mitochondrial fractions.[98]
question: Who discovered mitochondrial DNA?
answers: Margit M. K. Nass and Sylvan Nass