https://mcqslearn.com/tests/college-biology-tests.php?page=880-animals-growth-development
Spemann divided the zygote of salamander into how many parts | Animals: Growth And Development...
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https://journals.wlb-stuttgart.de/index.php/sh/article/view/18633
Rezension von: Spemann, Adolf, Menschen und Werke | Schwäbische Heimat
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https://especialidades.sld.cu/embriologia/historia-de-la-embriologia/personalidades/hans-spemann/
Embriología – Hans Spemann
hans spemann