sentence: Zeepvat (2004), p. 175 DNA testing on the remains of the royal family proved in 2009 that Alexei suffered from Hemophilia B. His mother and one of his sisters were carriers.
modified: Zeepvat (2004), p. 175 DNA testing on the remains of the royal family proved in 2009 that Alexei suffered from Hemophilia B. His mother and one of his sisters were carriers.