weirdscaryandusualstuff

"When Karen Keegan, a 52-year old Boston teacher, needed a kidney transplant, her three sons were tested if they are acceptable donors. Soon the tests revealed that two of Keegan’s sons did not match Keegan genetic profile. Further tests showed that Keegan has chimerism, a condition where two fraternal twins grow in the womb, but the first twin ‘absorbs’ the other twin, making the resulting embryo contain two different sets of DNA, oftentimes in different parts of the body. To prove that Keegan is indeed the boys’ mother, doctors began tracking the second DNA set in her body, and found it in her thyroid gland."

Via