
The living mice are another step in the test to see if IPC's can be manipulated in the same way as embroyonic stems cells have. "This test is considered a gold standard of pluripotency: Because the original double-chromosomed cells are doomed, the embryo can only become an adult if the added stem cells turn into every necessary cell type. Embryonic stem cells passed this test a decade ago. Now iPS cells have, too."


