BELGIUM - Fourteen years ago, Karen * gave birth to a daughter. A girl like other girls, but with a Y-chromosome, that's how Karen describes it herself. This Y-chromosome caused her daughter to develop testicles during pregnancy. Her body was insensitive to the testosterone that the testicles produce, so she developed as a girl. Coincidentally, Karen knew that something like that sometimes happens. Shortly before the delivery, she saw a documentary about children born with a variation in sex characteristics.