Sexual orientation chemical found in mice?

Chinese scientists say that a chemical in mouse brains controls sexual orientation, according to a study in Nature.
Says the BBC:

“Male mice bred without serotonin lose their preference for females. The researchers say it is the first time that a neurotransmitter has been shown to play a role in sexual preference in mammals. Experts have warned about the dangers of drawing conclusions about human sexuality.”

The BBC continued, “When just a male was introduced into the cage, the modified males were far more likely to mount the male and emit a ‘mating call’ normally given off when encountering females than unmodified males were. However, a preference for females could be ‘restored’ by injecting serotonin into the brain.”

Scientists say that because humans have been using Serotonin for years without an effect on sexual orientation, the finding is unlikely to be replicated in people.