A study of identical twins uncovered an immune receptor that may influence how the body stores fat and responds to obesity.

Identical twins Nancy and Margo benefitted from the procedure while in the womb as part of a world-first medical trial.

Looking closely at a pair of identical twins often leaves people wondering how two distinct individuals can appear so ...

When we think of identical twins, we often imagine mirror images — same face, same smile and perhaps even the same talents. But what surprises many is that these genetic carbon copies can have ...

The photos came from a 2009 study titled "Factors Contributing to the Facial Aging of Identical Twins." ...

'Neither of us have never married. We’ve got a really close relationship anyway, we didn’t have the time to bother with the opposite sex.' ...

Identical, or monozygotic, twins develop from the same fertilized egg that splits into two. These twins are the same sex and share the same genes. Sometimes called paternal twins, identical twins ...