Gene - a functional unit of heredity which is a segment of DNA located in a specific site on a chromosome. A gene directs the formation of an enzyme or other protein. 

Somatic cell - cell of the body other than egg or sperm. 

Somatic cell nuclear transfer - the transfer of a cell nucleus from a somatic cell into an egg from which the nucleus has been removed. 

Stem cells - cells that have the ability to divide for indefinite periods in culture and to give rise to specialized cells. 

Pluripotent -capable of giving rise to most tissues of an organism. 

Totipotent - having unlimited capability. Totipotent cells have the capacity to specialize into
extraembryonic membranes and tissues, the embryo, and all postembryonic tissues and organs. 

 
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