Cowan, C. A., Klimanskaya, I., McMahon, J., Atienza, J., Whitmyer, J., Zucker, J. P., Wang, S. P., Morton, C. C., McMahon, A. P., Powers, D., Melton, D. A. Derivation of embryonic stem-cell lines from human blastocysts.N ENGL J MED. 350 (13), 1353-1356 (2004).