By Bill Galluccio Apr 16, 2021 A team of researchers from the United States and China has made a breakthrough that has some ethicists concerned. The scientists successfully created embryos that are a mix of human and monkey cells. They hope the mixed-species embryos, which are known as chimeras, can be used to grow organs for people who need a transplant. "These chimeric approaches could be really very useful for advancing biomedical research not just at the very earliest stage of life, but also the latest stage of life," In the United States, over 110,000 people are currently on the waiting list for a life-saving organ transplant, and a new person is added to the list every ten minutes. More than 8,000 people die every year waiting for an organ.