Less 'delta'mtDNA EXP 4977' than normal in various types of tumors suggests that cancer cells are essentially free of this mutation - Dani, Maria Angela Castro; Dani, Sérgio U.; Lima, Silmara P. G.; Martinez, Alfredo Orden; Rossi, Benedito Mauro; Soares, Fernando; Zago, Marco Antônio; Simpson, Andrew J. G. (Genetics and Molecular Research, 2004)