. . . . "The methods of the invention can be used to genetically alter cells from any animal, including, for example, horses, cattle, sheep, pigs, goats, bison; fowl such as chickens, geese, ducks, turkeys, pheasant, ostrich and pigeon; fish such as salmon, tilapia, catfish, trout and bass; model experimental animals such as mice, rats and rabbits; and pets such as dogs and cats." . .