Johanna Rollhäuser-ter Horst

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Early gastrula ectoderm, combined with a denatured neuralizing inducer, was transplanted (exchanged) between different species of urodeles. The transplanted tissue forms retinae and brain on the host's belly, covered by epidermis and accompanied by many transplant specific neural crest derivatives: mesenchyme, melanophores, corium cells. The same ectoderm(More)
Anterior trunk neural folds were exchanged between neurula stages 15 to 16 (Harrison) of several Triturus species and Ambystoma mexicanum. Donor neural crest cells migrated ventrad before and during initial limb bud formation. They lined the early limb epidermis and became incorporated into the young blastema. Donor melanophores and non-melanophores(More)
Early Axolotl gastrula ectoderm was grafted into early Triturus neural stages in place of excised neural folds at the gill and anterior trunk level. Macroscopically the young graft behaves like normal neural fold material: it follows the closing host neural plate to the dorsal midline, folds into the host's interior and, especially in the gill region, moves(More)
The initial steps of neuralization by denatured embryonic tissue were studied in single and double layer Triturus ectoderm explants. 1. In single layer explants only part of the responding ectoderm is neuralized. A vesicle with continuous epidermoid envelope develops, from which neuralized spindle-shaped cell groups retract into the interior. Several neural(More)
Long strips of trunk neural fold, without underlying mesoderm, were isolated from several Triturus species and wrapped into gastrula ectoderm. The explants developed mainly spinal cord, rhombencephalon, melanophores, loose mesenchyme, mesenchymal condensations and, in a few cases, limb buds. Correlations between neural crest and limb development are(More)
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