Fig. 10. Mirror image duplication reported by Hans Spemann and Hilde Mangold.
Transplantation of dorsal rip tissue from an early gastrula of newt into
another early gastrula in the region that would become ventral epidermis
causes a mirror image duplication of the body axis
(Spemann and Mangold, 1924).
Reproduced with permission from Gilbert
(Gilbert, 1997).