James Thomson and coworkers derived the first human embryonic stem cell line at the University of Wisconsin-Madison in 1998. More recently, in 2005, scientists at Kingston University in England were purported to have found another category of stem cells. These were named cord blood embryonic-like stem cells, which originate in umbilical cord blood. Korean researcher Hwang Woo-Suk (2004-2005) claimed to have created several human embryonic stem cell lines from unfertilized human oocytes.
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