The reality is that it has been around for as long as male foetuses missed out on their suffi - cient share of male hormones.
事实是，只要男性胎儿错失足够份量的雄性激素，这种现象就会一直存在。
The researchers have already managed to produce pigs that were able to generate human blood by injecting blood stem cells from humans into pig foetuses
