The teams reported that they found the new cells in the innermost cell layer, the epiblast, of one week old rodent embryos, rather than in a very early stage embryo where ordinary ES cells are found.

• 这个研究小组报道称他们在一周大的,啮鼠动物的外胚层细胞层的最里发现这些新细胞，比起早期每个阶段胚胎的胚胎干细胞发现的地方，这里更多些。