Chimeras are also apparently way more prevalent than we had previously realized. http://www.nytimes.com/2013/09/17/science/dna-double-take.html?pagewanted=all

Chimeras are also apparently way more prevalent than we had previously realized. http://www.nytimes.com/2013/09/17/science/dna-double-take.html?pagewanted=all http://www.nytimes.com/2013/09/17/science/dna-double-take.ht... > But scientists are finding that it’s quite common for an individual to have multiple genomes. Some people, for example, have groups of cells with mutations that are not found in the rest of the body. Some have genomes that came from other people. > Women can also gain genomes from their children. After a baby is born, it may leave some fetal cells behind in its mother’s body, where they can travel to different organs and be absorbed into those tissues. “It’s pretty likely that any woman who has been pregnant is a chimera,” Dr. Randolph said