1999		January 29 Oregon researchers report repeated unsuccessful attempts to clone monkeys, calling into the question the feasibility of cloning humans.
1998		December 9 Japanese scientists clone several calves from a single adult cow, the most commercially important animal to be cloned to date. November 13 A biotechnology firm in Massachusetts claims to have created an embryo from human and cow cells using cloning techniques. August 20 Scientists in New Zealand said they cloned the lone surviving member of a rare breed of cow, the first rare or endangered species to be cloned. July 23 Scientists in Hawaii create dozens of cloned mice, marking the first documented cloning of adult mammals since researchers in Scotland announced the birth of Dolly the sheep. January 21 Scientists cloned the first genetically engineered calves, a feat they said would help them create herds of identical cows that make medicines in their milk.
1997		March 5 Warning against the temptation "to play God," President Clinton banned federal funding of human cloning research. February 24 Scottish researchers' startling achievement, long thought to be biologically impossible, was the first cloning of an adult mammal, the birth of a lamb named Dolly.