Twins in the same development in the womb when the exchange took place cells, most of the twins in the body are carrying some of their compatriots from the cells, they are chimera.

• 孪生子在同一个子宫中发育时会发生细胞交流，大多数孪生子体内都携带着某些来自其同胞的细胞，他们都是嵌合体。