The term has multiple uses in modern [[biology]]. One prominent definition is an animal that has multiple different populations of genetically distinct [[cell]]s that originated from different [[zygote]]s. Some humans are naturally chimeric, sharing cells from a twin (often one that was never born) or a parent.<ref>http://www.theage.com.au/cgi-bin/common/popupPrintArticle.pl?path=/articles/2003/11/27/1069825920727.html </ref> | The term has multiple uses in modern [[biology]]. One prominent definition is an animal that has multiple different populations of genetically distinct [[cell]]s that originated from different [[zygote]]s. Some humans are naturally chimeric, sharing cells from a twin (often one that was never born) or a parent.<ref>http://www.theage.com.au/cgi-bin/common/popupPrintArticle.pl?path=/articles/2003/11/27/1069825920727.html </ref> |