Tetraploid complementation! Y, S2 D! c7 {6 v( O% W
is considered the most stringent test for pluripotency and ' C6 R5 I$ h5 ~developmental potency, as any viable live-born animals resulting " E# Q B* V& d" M/ `) dfrom the injection of diploid ES or iPS cells to create the tetraploid b* Y/ L' Q: ~- Q, A
(4N) embryos (blastocysts) will be from the diploid donor cells.