The first living donor uterus transplants in the United States were performed at Baylor University Medical Center, officials announced on Wednesday. The experimental procedure was done four times between Sept. 14 and Sept. 22. In three of those cases, the organ had to be removed after the procedure because blood was not flowing to it successfully. Those patients are in recovery, according to officials. The fourth patient may be more receptive to the transplanted organ. "Her tests are showing good blood flow to the uterus," a statement said. "There are also no signs of rejection or infection at this time."