Cells derived from human pleuripotent stem cells are a lot more plastic than other cells transplanted in the past. In 20 16, the us. National institutes of health proposed lifting its funding moratorium on research using animal embryos containing human cells. Comments from the public, largely expressing opposition, flooded into the agency. The funding ban remains in place, but a 20 20 survey of 430 people found that 59 % supported human pig chimeric embryo rsearch designed to produce human tissues in pigs.