Most of the animals becomes gender differences in the process of fetal development. Experts from the University of Maryland established: sex under certain conditions may vary at the level of the brain. Data were confirmed in experiments with newborn rats, says Science World Report.
In the brain of female rats on the seventh day of development scientists have introduced inhibitors of DNA methyltransferase. Injection into the hypothalamus affect sexual behavior, the structure of the region was more similar to that of male rats.
Females while demonstrating sexual behavior of males. When you delete a gene of DNA-methyltransferase in females, the same thing happened. Scientists suggest that a large role is played by microglial cells, secreting prostaglandins. This group of substances involved in the process of masculinization (formation of masculine traits).