In this method, skin cells are turned directly into brain, heart, liver, or pancreas cells without going through a stem cell stage first. (gladstone.org)
By the 4 - 8 cell stage of life, human embryos have to «turn on» their own genes and start making their own proteins. (pacificfertilitycenter.com)
«It's intriguing what the relative orientation of the embryo at the eight - cell stage does to determine the left - right symmetry in the whole developmental pathway,» she says. (newscientist.com)