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Masayuki Sumida, a professor at the Institute for Amphibian Biology at Japan's Hiroshima University, bred the frog to be a humane learning tool.
"You can watch organs of the same frog over its entire life, as you don't have to dissect it," Sumida told the news agency Agence France-Presse. The scientist announced his research last week at an academic meeting.
Dissecting animals for science has sparked controversies worldwide, even prompting some companies to create computer simulations as cruelty-free alternatives.