Researchers engineered a mouse with two additional limbs instead ... the bioengineered embryos had genitals similar to two extra hind limbs. “I didn’t choose the project, the project chose ...

The team compared 10 to 17-day-old mouse embryos with and without functioning versions of Tgfbr1. Scientists were aware that, in most four-legged mammals, the genitalia and the hind limbs develop ...