Human Cloning-blastocyst stage February 2004, South Korea ·30 embryos have grown for about 6 days containing about 100 cells Dr Woa suk Hwang, Dr Shin Kong moon National Seoul UniversityHuman Cloning – blastocyst stage • February 2004, South Korea • 30 embryos have grown for about 6 days, containing about 100 cells • Dr. Woo Suk Hwang, Dr. Shin Yong Moon National Seoul University