Corrections and Clarifications
The news article "The culture of credit" by Jon Cohen (23 June, p. 1706) described the Nobel Prize-winning work of Phillip Sharp and Richard Roberts as the discovery of "gene splicing" it should have used the term "split genes" instead. The third sentence of the caption for the diagram on page 1706 should have read, "After a gene is `transcribed' into RNA (2), the regions corresponding to introns are snipped out (3)." The credit for that diagram should have noted that it referred only to the top panel of the diagram.