The authors in Korea, led by Woo-suk Hwang, reported the cloning of a human blastocyst using somatic cell nuclear transfer, and deriving pluripotent embryonic stem cells from that cloned blastocyst. In doing so they claimed to have cloned the first human being. Numerous extensive scientific investigations resulting from testimony of the second author, Young June Ryu, resulted in an official "Editorial Retraction" published in Science, 311, 2006, p.335.  At that time only 7 of the 12 co-authors of the paper agreed to retract their claims.

(Thanks to Juan Weiss for this reference and its interpretation.)