Learning fine embryonic surgery
Born Hilde Pröscholdt, Mangold joined Spemann in Freiburg in 1920. She learned to cut and transplant millimetre-scale newt embryonic tissues using fine glass instruments and hair-based tools. The work also depended on the animals’ seasonal supply of embryos.
Distinguishing donor and host
In 1921–1922 Mangold transplanted dorsal blastopore-lip tissue to the opposite region of another embryo. The species’ different natural pigmentation showed that the induced neural structures included surrounding host cells, not simply descendants of the graft. This supplied evidence for induction.
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Recording and publishing the results
The experiments formed Mangold’s doctoral work and appeared in a joint paper with Spemann in 1924. Detailed drawings recorded the distribution of tissues of different origins. She died in a household accident that year. Her transplantations and observations remain central to the history of the Spemann–Mangold organizer.