Medical research

FILE - In this Monday, Nov. 13, 2017 file photo, Brian Madeux, starts to receive the first human gene editing therapy for Hunter syndrome, as his girlfriend, Marcie Humphrey, left, applauds at the UCSF Benioff Children's Hospital in Oakland, Calif. At right is nurse practitioner Jacqueline Madden. On Thursday, Feb. 7, 2019, scientists gave an update on the first effort to edit genes, or permanently change the DNA, of about a dozen adults, including Madeux, with metabolic diseases. (AP Photo/Eric Risberg)

FILE - This Wednesday, Oct. 28, 2009 file photo shows toothpaste on a toothbrush in Marysville, Pa. A report released by the Centers for Disease Control and Prevention on Thursday, Jan. 31, 2019, says too many young kids are using too much toothpaste, increasing their risk of streaky or splotchy teeth when they get older. (AP Photo/Carolyn Kaster, File)

A pedestrian walk past a building housing the Warren Alpert Medical School of Brown University, Wednesday, Jan. 30, 2019, in Providence, R.I. On Tuesday a prominent physicians' group asked the U.S. Department of Agriculture to investigate the school, arguing that it is violating the law by using live pigs for training in emergency medicine. (AP Photo/Jennifer McDermott)

FILE - This Aug. 29, 2018 photo shows an arrangement of prescription Oxycodone pills in New York. In a report released on Thursday, Jan. 17, 2019, health officials are looking into a possible link between prescription opioids and a birth defect called gastroschisis. (AP Photo/Mark Lennihan)

FILE - In this Friday, Feb. 9, 2018 file photo, Henry Beverly, 73, battles the flu while tended to by nurse Kathleen Burks at Upson Regional Medical Center in Thomaston, Ga. As of January 2019, the current flu season is shaping up to be gentler than last winter’s unusually brutal one, health officials say. (AP Photo/David Goldman)

FILE - In this Aug. 20, 2008 file photo, a young girl mimics the pose of a Chinese Olympic athletes depicted in Coca-Cola advertising, at the Olympic green in Beijing. The International Life Science Institute, a group funded by the food industry, undermined China’s efforts to keep obesity rates in check by overemphasizing the importance of physical activity rather than dietary restrictions, according to a new paper. The group sponsored obesity conferences on exercise science with speakers including Coke-funded researchers and a Coke executive. ILSI says it does not profess to have been perfect, but that it has adopted stricter guidelines. (AP Photo/Elizabeth Dalziel)

FILE - In this Oct. 22, 2008 file photo, a researcher examines human embryonic stem cells with a microscope in Michigan. On Thursday, Dec. 20, 2018, the Centers for Disease Control and Prevention reported that at least 12 patients in three states _ Florida, Texas and Arizona _ became infected after getting embryonic stem cell injections for problems like joint and back pain. (AP Photo/Paul Sancya, File)

FILE - In this Oct. 25, 2018, file photo, Rep. Mark Meadows, R-N.C., speaks to media on Capitol Hill in Washington. Lawmakers clashed over science, ethics and politics Thursday, Dec. 13, at a House hearing on using fetal tissue in critically important medical research, as the Trump administration reviews the government’s ongoing support for such studies. “Most of my constituents don’t understand when you harvest baby parts, why that is OK,” said Meadows, who chaired the hearing by the Oversight & Government Reform committee. (AP Photo/Carolyn Kaster)

In this Oct. 9, 2018, photo, Zhou Xiaoqin installs a fine glass pipette into a sperm injection microscope in preparation for injecting embryos with Cas9 protein and PCSK9 sgRNA at a lab in Shenzhen in southern China's Guandong province. China's government on Thursday, Nov. 29, 2018, ordered a halt to work by a medical team that claimed to have helped make the world's first gene-edited babies. (AP Photo/Mark Schiefelbein)