Resumen de Updates.

• The article presents several updates to previously published articles. The discovery of evidence for disease-induced extinction is reported, which updates "Mammoth Kill" in the February 2001 issue. A study in which mice were cloned from frozen genetic material is reported, which updates "Cloning Noah's Ark" from November 2000. Hydrogen sulfide's vasodilation properties are also reported, which updates "Biological Roles of Nitric Oxide" from May 1992 and "Insights Into Shock" from February 2004.