Actually, one of those studies found that girls from girl-only schools ventured more often into "male-dominated" professions like engineers, technicians or other fields where natural sciences play a large role.
Also, I heavily doubt that girls are told to go for pink and boys are taught to like guns. At least a large part of that behaviour is not nurture but nature. Or epigenetics.

And here some of the studies: ftp://ftp.iza.org/RePEc/Discussionpaper/dp4026.pdf
ftp://ftp.iza.org/RePEc/Discussionpaper/dp2037.pdf
http://www.hausarbeiten.de/faecher/vorschau/98149.html (in German)