Twins often feel like they have a special connection, but for one California woman, the connection is particularly visceral — she is her own twin. The woman, singer Taylor Muhl , has a condition called chimerism, meaning she has two sets of DNA , each with the genetic code to make a separate person. The rare condition can happen during fetal development; in Muhl's case, she had a fraternal twin that she absorbed in the womb, she told People magazine. The condition explains why Muhl has what appears to be a large birthmark on her torso.
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By Michael Marshall. The discovered piece of bone, shown from four angles. The bone belonged to an ancient human who had a Neanderthal mother and a Denisovan father. The find is either a stunning stroke of luck or a hint that hominins interbred more often than we thought.
This Woman Is Her Own Twin: What Is Chimerism?
Adolescence is a time for rapid growth that represents an opportunity to influence peak bone mass. Prebiotic agents, such as galacto-oligosaccharides GOS , increase Ca absorption in animal models and postmenopausal women. The objectives of the present study were to investigate the dose-response relationship of GOS supplementation on Ca absorption during growth and to assess changes in colonic microbiota to better understand the mechanism by which GOS is acting. Fractional Ca absorption was determined from urinary Ca excretion over 48 h at the end of each 3-week period using a dual stable isotope method. Faecal microbiota and bifidobacteria were assessed by PCR-denaturing gradient gel electrophoresis and quantitative PCR.
But chimeras aren't always man-made—and there are a number of examples of human chimeras that already exist. A chimera is essentially a single organism that's made up of cells from two or more "individuals"—that is, it contains two sets of DNA, with the code to make two separate organisms. One way that chimeras can happen naturally in humans is that a fetus can absorb its twin. This can occur with fraternal twins, if one embryo dies very early in pregnancy, and some of its cells are "absorbed" by the other twin. The remaining fetus will have two sets of cells, its own original set, plus the one from its twin.