Yes, here's a reference.....  I read about it from Adelle Davis's books in
the seventies.

http://www.mercola.com/2002/may/8/cooking_cancer.htm
"I have been consuming raw egg yolks for several months now with major
benefits to my cholesterol level. The egg whites are one of the clear
exceptions to raw food as they should be cooked to avoid biotin (a B
vitamin) depletion."