On my weekly visit to a research laboratory, I encountered a 14-month-old dog with lameness in its left hind limb. The dog is one of a small colony of male beagles, aged between 1 and 3 years ...

According to Nature, Mallo’s student Anastasiia Lozovska came to his office to tell him that she had found out that one of the bioengineered embryos had genitals similar to two extra hind limbs.