The controversy surrounding Adolf Hitler's skull fragments is a little embarrassing for the Russian secret services. In 2000 they presented a skull fragment and a piece of jawbone that they claimed were the remains of the Nazi leader. It was an attempt to quash outlandish rumors that he had escaped alive at the end of World War II. But in October US researchers presented the results of DNA tests on the skull and said it definitely didn't belong to the dictator because it was from a female. Scientists had already harbored doubts about the authenticity of the piece of bone because it was thinner than a male's usually is. The bone seemed very thin -- male bone tends to be more robust. It corresponds to a woman between the ages of 20 and 40," said Nick Bellantoni of the University of Connecticut. The position of the exit wound at the back of the skull also made scientists suspicious because eyewitnesses said Hitler had committed suicide by firing into his right temple. Bellantoni said he was allowed to work on the skull for an hour. When he flew home from Moscow he had two samples in his luggage: a sample from the skull fragment and one sample of blood from the sofa on which Hitler is said to have shot himself. Bellantoni was able to compare the bloodstains on the blood-stained fabric with photos the Soviets took after they seized Hitler's bunker in Berlin. The stains had matched those in the photos. The research showed that the sofa blood DNA did not match the skull DNA. The sofa blood was male and the skull belonged to a woman, claimed Bellantoni.