TOKYO – APRIL 23: Kaguya, the worlds first fatherless mammal, is seen at a lab at the Tokyo University of Agriculture on April 23, 2004 in Tokyo. Kaguya was created by Tomohiro Kono of the Tokyo University of Agriculture and a group of researchers chiefly from Japan and South Korea. They have succeeded in creating a mouse without using a sperm donor, but instead used genetic data from two eggs.