This Sept. 27, 2018 photo shows petri dishes with citrus seedlings that are used for gene editing research at the University of Florida in Lake Alfred, Fla. Gene-editing tools, with names like CRISPR and TALEN, promise to alter foods precisely, and cheaply _ without necessarily adding foreign DNA. Instead, they act like molecular scissors to alter the letters of an organism's own genetic alphabet. (AP Photo/Federica Narancio)