Ralph was the first cloned rat. To give birth to Ralph, 129 embryos were implanted into 2 females. One became pregnant and gave birth to three rats; Ralph was the first to be born. Ralph has been cloned for medical purposes requiring genetically identical animals including testing in impact of genetics and the environment in the development of many diseases, as well as to take away and modify genes, as well as to solve a problem with rat physiology. Cloned from an adult cell, Ralph was cloned by researchers from China and France.
- Pilcher, Helen R. (26 September 2003). "First cloned rats born". Nature.com. Retrieved 30 August 2012. "Ten-month-old rodent Ralph"
- Arnold, Paul. "Ralph: The World's First Cloned Rat". Bright Hub. Retrieved August 2012.
- "Ralph, the fertile cloned rat unveiled". BioNews. Retrieved August 2012.
- "Rat called Ralph is latest clone". BBC. Retrieved August 2012.
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