To make it possible for cellular agriculture—the process of growing meat in bioreactors—to feed millions of people, several technical challenges will have to be overcome. Muscle cells from chicken, fish, cows, and other food sources will have to be grown to produce millions of metric tons per year. Toward this goal, researchers at Tufts University Center for Cellular Agriculture (TUCCA) have developed immortalized bovine muscle stem cells (iBSCs) that can grow rapidly and divide hundreds of times, and possibly indefinitely.